Wednesday, June 17, 2020
Congratulations to the 2020 Graduates from Our Research Group! (Humans First; Mathematicians Second)
CONGRATULATIONS to the Class of 2020 from the research group!
And thanks to Prof. Chad Topaz for a wonderful commencement speech (one of the best I ever heard and so meaningful to me). Thanks to the guests who joined us.
The graduating class of 2020:
Postdoc: Heather Zinn Brooks
Undergrads: Qinyi Chen, Unchitta Kanjanasaratool, Tony Liu
PhD students: Michelle Feng, Yacoub Kureh, William Oakley
#truecolors
Here are a couple of pictures.
And here is the text of Chad's speech.
"Are mathematicians human?"
I was very unsure of how to begin this speech, and so I did the natural thing: I Googled “graduation speech opening” and I found a site with the following advice, which I am going to obey.
1. Offer formal words recognizing the honored guests.
I hereby decree that this honored group seems familiar; have we met before?
2. Use humor. If you are confident that your humor will work, making everyone laugh will be a great start.
I am confident. Please go ahead and laugh now.
3. Enthusiastically congratulate graduates on their success.
From my heart, congratulations.
4. State the topic of your speech.
Those of you who know me know that I often go against the crowd. Some graduation speech themes are all too common, so I’ll be avoiding the following messages in this speech:
- Challenges are opportunities
- Be yourself
- The world is your oyster
- Love will triumph over all
- With great power comes great responsibility
So, for this speech, I have chosen the topic “Are mathematicians human?"
I was a postdoctoral fellow in this department from 2003 - 2006. During the last year of my postdoc, and wanting desperately to stay in academia, I applied for tenure track jobs. While I was lucky to get a couple of offers, none of the offers would have resolved my dual career couple issues. It seemed reasonable that I'd have a better chance of finding work in Los Angeles than my husband would in rural Maine. So I made one of the hardest decisions of my life: I stayed in Los Angeles and, in doing so, quit being a mathematician. But not before, in a moment of extreme frustration and angst, I committed the only physically violent act of my adult life by hurling a bowl of oatmeal at the wall of my apartment.
Sometimes we don't realize what part of our identity means until we don't have it anymore. I didn't see this coming, but when I could no longer call myself a mathematician, or at least not professionally, I wasn't sure what I was anymore.
The next year of my life began fairly miserably. I worked as a college administrator on another campus in a unit that was a poor fit for me. I had few personal goals other than feeling sorry myself. Gradually, though, things turned around. I slowly built stronger relationships with friends. I got involved in service work related to issues I cared about. I rediscovered how much I loved playing chamber works with other musicians. I reconnected with all of the parts of myself that I had let shrink.
I stopped identifying principally as a mathematician and started identifying principally as a human.
But what makes us human? Characteristics and abilities once thought to distinguish us from other animals -- the use of tools, the ability to recognize ourselves, the size of our brains, and much more -- turn out to be found in various corners of the animal kingdom. Some evidence from the natural sciences, though, does suggest what makes humans unique.
First, we are human because of the degree to which we are wired to help each other. In psychology experiments, children as young as 14 months will spontaneously help a person who is struggling or who looks worried or who drops an item. At age two years, children will help someone who isn't even aware of their own need for help, say, because they didn't realize they had dropped an item. And rewards don't seem to play a role. In experiments on 20 month old toddlers, those who had previously received rewards for being helpful acted equally helpfully as a control group that hadn't received rewards. Other species certainly have been observed to engage in helping behavior, but within different parameters. For instance, close by on the evolutionary tree, chimpanzees will share food. Chimps, however, appear to be far more selective about their helping behavior, sharing only with close relatives or potential mates. In short, humans appear to be wired to be indiscriminately cooperative.
Second, we are human because of our ability to imagine and know things beyond our senses. Take the famous psychology experiment called the Sally-Anne task. In this task, there are two dolls named Sally and Anne. A young child, who is the subject of the experiment, sees Sally putting a marble in a basket while Anne watches. Then Sally leaves the room. While she's gone, Anne removes the marble from the basket and puts it inside a box. Then Sally comes back into the room. The experimenter asks the child where Sally will look for the marble, most children answer that Sally will look in the basket, where she had originally left it. The child knows that the marble is not there, but understands that Sally will have a different thought. Let me emphasize this: it's not merely that the child knows that the marble moved. The child can put themself in the mindset of another person and imagine what that person thinks. On the other hand, in a version of the experiment designed to assess chimpanzees, the chimps generally failed the test.
So two possible answers to "what makes us human" are our level of radical, selfless cooperation and our capacity to put ourselves in the shoes of another, a quality we sometimes refer to as empathy.
This speech would not be authentic if I did not call out that we are living during challenging times. Now let's be real: epidemic disease has been with humankind for a long time, with the earliest records of an influenza-like epidemic coming from central and Southern Asia around 1200 BC. Racial injustice has been with us in the United States since before we even WERE the United States. Still, we seem to be in an especially challenging moment right now, with bungled public health efforts and the continued killing of Black people by the police. It can be hard to believe that cooperation and empathy are our nature. So I take solace in the aforementioned scientific evidence and I say thank goodness for lab experiments.
It's not just on the national and international stages that the better parts of human nature can be obscured. You will have moments in your professional and personal lives when you will have the opportunity to put your humanity second to more immediate or more tangible or just plan easier ends. My message to you today is simple: always, first and foremost, be a human.
I asked Mason to give me a few very brief words about the human qualities of each of you, graduates. Mason respected my request... except for the brevity part! So please know that when I mention each of you, the brevity is mine, not his.
Heather, you are a valued and highly respected source of wisdom.
Michelle, your creativity and passion are inspirational.
Yacoub, you are driven to help, from each individual student up to saving the world.
Will, your good cheer powers not only your own efforts, but lifts those around you.
Quinyi, you have a rare blend of determination and humility.
Unchitta, you have limitless compassion.
Tony, you fearlessly reach out to those in need.
By the way, while today is mostly about you, graduates, it is also a little bit about Mason. It doesn't escape my notice that your advisor displays stellar human qualities as well, which is perhaps why we are drawn to him.
To the seven honored and accomplished celebrants, I wish you hearty congratulations and all the best for the future. Thanks to your hard work and dedication, you are outstanding students, scholars, teachers, mathematicians, thinkers. But most of all, you are outstanding humans.
Tuesday, June 09, 2020
"Spatial Strength Centrality and the Effect of Spatial Embeddings on Network Architecture"
Title: "Spatial Strength Centrality and the Effect of Spatial Embeddings on Network Architecture"
Authors: Andrew Liu and Mason A. Porter
Abstract: For many networks, it is useful to think of their nodes as being embedded in a latent space, and such embeddings can affect the probabilities for nodes to be adjacent to each other. In this paper, we extend existing models of synthetic networks to spatial network models by first embedding nodes in Euclidean space and then modifying the models so that progressively longer edges occur with progressively smaller probabilities. We start by extending a geographical fitness model by employing Gaussian-distributed fitnesses, and we then develop spatial versions of preferential attachment and configuration models. We define a notion of “spatial strength centrality” to help characterize how strongly a spatial embedding affects network structure, and we examine spatial strength centrality on a variety of real and synthetic networks.
Sunday, June 07, 2020
The COVID-19 Graduating Class
I bought one of these for each graduating member of my research group. pic.twitter.com/H8W7Dxg2aF
— Mason Porter (@masonporter) June 7, 2020
Thursday, June 04, 2020
A Great Ph.D. Defense by Dr. Will Oakley
Congratulations to Dr. Will Oakley for a successful defense of his Ph.D. dissertation, titled "Strong Consensus-Seeking in a Model of Social Consensus Formation"! pic.twitter.com/SxCEOkMpdr
— Mason Porter (@masonporter) June 4, 2020
Tuesday, June 02, 2020
"Fitting in and Breaking Up: A Nonlinear Version of Coevolving Voter Models"
Title: Fitting in and Breaking Up: A Nonlinear Version of Coevolving Voter Models
Authors: Yacoub H. Kureh and Mason A. Porter
Abstract: We investigate a nonlinear version of coevolving voter models, in which node states and network structure update as a coupled stochastic process. Most prior work on coevolving voter models has focused on linear update rules with fixed and homogeneous rewiring and adopting probabilities. By contrast, in our nonlinear version, the probability that a node rewires or adopts is a function of how well it “fits in” with the nodes in its neighborhood. To explore this idea, we incorporate a local-survey parameter σ_i that encodes the fraction of neighbors of an updating node i that share its opinion state. In an update, with probability σ^q_i(for some nonlinearity parameter q), the updating node rewires; with complementary probability 1 − σ^q_i, the updating node adopts a new opinion state. We study this mechanism using three rewiring schemes: after an updating node deletes one of its discordant edges, it then either (1) “rewires-to-random” by choosing a new neighbor in a random process; (2) “rewires-to-same” by choosing a new neighbor in a random process from nodes that share its state; or (3) “rewires-to-none” by not rewiring at all (akin to “unfriending” on social media). We compar eour nonlinear coevolving voter model to several existing linear coevolving voter models on various network architectures. Relative to those models, we find in our model that initial network topology plays a larger role in the dynamics and that the choice of rewiring mechanism plays a smaller role. A particularly interesting feature of our model is that, under certain conditions, the opinion state that is held initially by a minority of the nodes can effectively spread to almost every node in a network if the minority nodes view themselves as the majority. In light of this observation, we relate our results to recent work on the majority illusion in social networks.
Saturday, May 30, 2020
"Nonlinearity + Networks: A 2020 Vision"
Title: Nonlinearity + Networks: A 2020 Vision
Abstract: I briefly survey several fascinating topics in networks and nonlinearity. I highlight a few methods and ideas, including several of personal interest, that I anticipate to be especially important during the next several years. These topics include temporal networks (in which a network’s entities and/or their interactions change in time), stochastic and deterministic dynamical processes on networks, adaptive networks (in which a dynamical process on a network is coupled to dynamics of network structure), and network structure and dynamics that include “higher-order” interactions (which involve three or more entities in a network). I draw examples from a variety of scenarios, including contagion dynamics, opinion models, waves, and coupled oscillators.
And in case you want to help spread the word, here is my recent tweet.
Here's the final, published version of my forward-looking chapter, "Nonlinearity + Networks: A 2020 Vision": https://t.co/eLdlD45oe8
— Mason Porter (@masonporter) May 30, 2020
It appears in the book "Emerging Frontiers in Nonlinear Science" (https://t.co/IBGX7bMyeA)
Friday, May 29, 2020
Topography Will Tear Us Apart
Unknown Topographies https://t.co/uyNZF9G7TX
— Brian Glaser (@bsglaser) May 29, 2020
(Tip of the cap to Dave Richeson.)
Thursday, May 28, 2020
An Awesome Ph.D. Defense by Dr. Yacoub Kureh!
CONGRATULATIONS to Dr. Yacoub Kureh (@Yacoub_Kureh) on a successful and very impressive defense of his PhD thesis, called "Nonlinear opinion models and other networked systems"!!! pic.twitter.com/fXDNIE1GRX
— Mason Porter (@masonporter) May 28, 2020
Tuesday, May 26, 2020
Starting Out the Hard Way
Two decades later, I am still the most opinionated TA that he's ever had with respect to how to teach a course. People should get the most difficult person out of the way at the beginning, right?
He confirmed this and found out about the ducks at our meeting this morning! It’s perfect bc he tells me that when I need a debugging break, I should talk with a rubber duck, so I think the rubber duck that is living in the tex doc right now has a permanent home 😊 (for now)
— Mallory Gaspard (@mallorygaspard) May 27, 2020
Thursday, April 30, 2020
"Community Matters"
Title: Community Matters
Authors: Anna C. F. Lewis, Nick S. Jones, Mason A. Porter, and Charlotte M. Deane
"A Framework for the Construction of Generative Models for Mesoscale Structure in Multilayer Networks"
Title: A Framework for the Construction of Generative Models for Mesoscale Structure in Multilayer Networks
Authors: Marya Bazzi, Lucas G. S. Jeub, Alex Arenas, Sam D. Howison, and Mason A. Porter
Software: You can find code for the model, as well as the outputs of the computational experiments in our paper, at this page.
Abstract: Multilayer networks allow one to represent diverse and coupled connectivity patterns—such as time-dependence, multiple subsystems, or both—that arise in many applications and which are difficult or awkward to incorporate into standard network representations. In the study of multilayer networks, it is important to investigate mesoscale (i.e., intermediate-scale) structures, such as dense sets of nodes known as communities, to discover network features that are not apparent at the microscale or the macroscale. The ill-defined nature of mesoscale structure and its ubiquity in empirical networks make it crucial to develop generative models that can produce the features that one encounters in empirical networks. Key purposes of such models include generating synthetic networks with empirical properties of interest, benchmarking mesoscale-detection methods and algorithms, and inferring structure in empirical multilayer networks. In this paper, we introduce a framework for the construction of generative models for mesoscale structures in multilayer networks. Our framework provides a standardized set of generative models, together with an associated set of principles from which they are derived, for studies of mesoscale structures in multilayer networks. It unifies and generalizes many existing models for mesoscale structures in fully ordered (e.g., temporal) and unordered (e.g., multiplex) multilayer networks. One can also use it to construct generative models for mesoscale structures in partially ordered multilayer networks (e.g., networks that are both temporal and multiplex). Our framework has the ability to produce many features of empirical multilayer networks, and it explicitly incorporates a user-specified dependency structure between layers. We discuss the parameters and properties of our framework, and we illustrate examples of its use with benchmark models for community-detection methods and algorithms in multilayer networks.
Tuesday, April 28, 2020
A Spectacular Ph.D. Thesis Defense by Michelle Feng!
CONGRATULATIONS to Dr. Michelle Feng (@michellehfeng ) on a successful — and, in fact, spectacular — defense of her Ph.D. thesis, called "Topological Tools for Understanding Complex Systems"!!!!
— Mason Porter (@masonporter) April 28, 2020
You will be hearing a lot from her in the future. pic.twitter.com/gpjueTA6CW
Monday, April 27, 2020
Short Course on "Mathematical and Computational Methods for Complex Social Systems" at the 2021 Joint Mathematics Meetings!
An exciting announcement!
— Mason Porter (@masonporter) April 28, 2020
We (@hzinnbrooks + @michellehfeng + Me + @al_volkening) are organizing an @amermathsoc 'Short Course' on "Mathematical and Computational Methods for Complex Social Systems" at the 2021 Joint Mathematics Meetings (@JointMath)! https://t.co/A4rXWVOWSU pic.twitter.com/e9hTEDLCN4
Sunday, April 26, 2020
"And Then the Dragons Arrived."
Let's try this with my own book: "Traditionally, much of the study of networks has focused on structural features. And then the dragons arrived."
— Mason Porter (@masonporter) April 27, 2020
You know, that kind of works. I want to write this book!
This is the book (coauthored with @gleesonj): https://t.co/PtNjiV7voB https://t.co/lZevcObzYt
Saturday, April 25, 2020
Dramatic Readings of Academic Research and Other Scholarly Works
I am doing "dramatic readings" of scholarly research as part of a series of short podcasts for the Annals of Improbable Research (@improbresearch).
— Mason Porter (@masonporter) April 25, 2020
A new one dropped today ("Mask Wiggling"): https://t.co/I9zhPODp1H
Another one ("Cocker’s Arithmetick"): https://t.co/66twU8zjqn
Monday, April 20, 2020
A Paper Called "Lunch Menu" on Google Scholar
"Lunch Menu" by T. B. Dishes and P. Kids also exists, cited 14 times https://t.co/8RR1rvYfKs
— Hiroki Sayama (@HirokiSayama) April 21, 2020
Tuesday, April 14, 2020
"A Model for the Influence of Media on the Ideology of Content in Online Social Networks"
Title: A Model for the Influence of Media on the Ideology of Content in Online Social Networks
Authors: Heather Z. Brooks and Mason A. Porter
Abstract: Many people rely on online social networks as sources of news and information, and the spread of media content with ideologies across the political spectrum influences online discussions and impacts offline actions. To examine the impact of media in online social networks, we generalize bounded-confidence models of opinion dynamics by incorporating media accounts as influencers in a network. We quantify partisanship of content with a continuous parameter on an interval, and we formulate higher-dimensional generalizations to incorporate content quality and increasingly nuanced political positions. We simulate our model with one and two ideological dimensions, and we use the results of our simulations to quantify the “entrainment” of content from nonmedia accounts to the ideologies of media accounts in a network. We maximize media impact in a social network by tuning the number of media accounts and the numbers of followers of those accounts. Using numerical computations, we find that the entrainment of the ideology of content that is spread by nonmedia accounts to media ideology depends on a network's structural features, including its size, the mean number of followers of its nodes, and the receptiveness of its nodes to different opinions. We then introduce content quality—a key novel contribution of our work—into our model. We incorporate multiple media sources with ideological biases and quality-level estimates that we draw from real media sources and demonstrate that our model can produce distinct communities (“echo chambers”) that are polarized in both ideology and quality. Our model provides a step toward understanding content quality and ideology in spreading dynamics, with ramifications for how to mitigate the spread of undesired content and promote the spread of desired content.
Friday, April 10, 2020
Los Angeles Without Smog
Los Angeles with no smog..
— Bill Gross (@Bill_Gross) April 10, 2020
Aerial view of downtown from Silverlake via @alanwdang pic.twitter.com/qOxAAzDzmX
(Tip of the cap to Predrag Cvitanovic.)
Sunday, March 29, 2020
RIP Philip Anderson (1923–2020)
I can't yet find an obituary to include as a hyperlink.
Update (3/30/20): The New York Times has published an obituary.
Update (3/30/20): Here is an obituary from Princeton University.
Saturday, March 28, 2020
RIP Nate 'n Al Delicatessen (1945–2020)
I have been getting food from there for more than 40 years, and it has my favorite corned-beef sandwiches.
Well, I guess I ordered my last two corned beef sandwiches from them last night. :( I got it delivered. (I'll nuke the second one for dinner today or tomorrow.)
I was going to eat dinner there with some of my students on 14 March, but I necessarily cancelled that dinner. Some of them have tried it before, and I have now informed the one who mentioned last night that she might try it that today is the day for her if it's ever going to happen.
I'll share a different one of my childhood restaurants with my students. (The Apple Pan is a difficult choice when things get back to normal, though, given the way that seating works there.)
Update (3/29/20): Nate 'n Al's isn't quite dead yet. Hopefully, they'll make it through this crisis and come back around when we get past it.
Friday, March 20, 2020
Cooking: Yet Another Sign of the Apocalypse
And, well, here we are.
(The picture above is the first in a sequence of five pictures. I ate those noodles out of sheer stubbornness.)
Another Sign of the Apocalypse: Oxford has Cancelled its Conventional Exams
Thankfully, Coffee is an Essential Service.
Time has no Meaning.
Also, space has no meaning.
Also, spacetime has no meaning.
(In addition to the fact that now I end up using the same technology to talk to somebody who is 1 mile away as somebody who is on the other side of the world, and that I can be anywhere in the world when I teach my courses online — which is inspiring these "delightful" thoughts — I naturally thought of a line from this sketch. One of my friends has subsequently reminded me of the quote "Time is an illusion. Lunchtime, doubly so.")
My mood is also captured by this video.
It's (Probably Not) the End of the World as we Know it (and I Feel Fine)
(Tip of the cap to the Improbable Research blog.)
Tuesday, March 17, 2020
A Real-World Devilish Wish
It is very strange to wake up in that kind of world. Most people are trying their best to do more extreme forms of many of the things that I try to do anyway in my normal life.
This is the type of thing that I would do as a Dungeon Master to a wish-maker who didn't phrase their wish very carefully.
Monday, March 16, 2020
Way Ahead of My Time
I was way ahead of my time.
Saturday, March 14, 2020
A Song for Today's Era of Social Distancing
Second: I am proud that one of my PhD students brought up this song in his e-mail just now. Between that and the fact that another of my PhD students has The Princess Bride as one of her favorite movies.
(In case you needed even more evidence that I have awesome students...)
Preparing to Teach Classes in Cyberspace
In preparation for online lecturing, I am practicing using Zoom with my cousin.
— Mason Porter (@masonporter) March 14, 2020
There appears to be a time lag. pic.twitter.com/GgRI95tku9
Friday, March 13, 2020
Behind-the-Scenes Pictures of Professors Suddenly Transitioning to Online Teaching
I am greatly looking forward to behind-the-scenes pix of profs improvising while abruptly transitioning to remote teaching. https://t.co/Lww5ZHzfY5
— Mika McKinnon (@mikamckinnon) March 13, 2020
A Sign of the End of Days
Now we know that we've reached the end of days.
(That said, they were faster than UCLA for blanket approval.)
Thursday, March 12, 2020
The Major League Baseball Season is Delayed
This is perhaps the first time in my life that I have ever been strongly in favor of baseball being cancelled. Simply, it's the right thing to do.
Baseball is one of my coping mechanisms, but I will find others.
Glora Gayner Demonstrating Thorough Hand-Washing by Singing "I Will Survive"
Tuesday, March 10, 2020
My Personalized Pandemic Card
Here is my personalized Pandemic card. pic.twitter.com/WRnyw60clU
— Mason Porter (@masonporter) March 10, 2020
In case you're interested, you can find templates on this website.
Friday, March 06, 2020
"Dominance, Sharing, and Assessment in an Iterated Hawk–Dove Game"
(I write this even though they pulled the trigger without showing us the final version — despite our explicit request — and a couple of minor glitches with the references reflect this. Following instructions was consistently very difficult for these typesetters.)
Anyway, I really like this paper, and I think there are some very cool avenues to pursue with it as a starting point. Our public code will hopefully help encourage such efforts. Here are some details.
Title: Dominance, Sharing, and Assessment in an Iterated Hawk–Dove Game
Authors: Cameron L. Hall, Mason A. Porter, and Marian S. Dawkins
Abstract: Animals use a wide variety of strategies to reduce or avoid aggression in conflicts over resources. These strategies range from sharing resources without outward signs of conflict to the development of dominance hierarchies, in which initial fighting is followed by the submission of subordinates. Although models have been developed to analyse specific strategies for resolving conflicts over resources, little work has focused on trying to understand why particular strategies are more likely to arise in certain situations. In this paper, we use a model based on an iterated Hawk–Dove game to analyse how resource holding potentials (RHPs) and other factors affect whether sharing, dominance relationships, or other behaviours are evolutionarily stable. We find through extensive numerical simulations that sharing is stable only when the cost of fighting is low and the animals in a contest have similar RHPs, whereas dominance relationships are stable in most other situations. We also explore what happens when animals are unable to assess each other’s RHPs without fighting, and we compare a range of strategies for contestants using simulations. We find (1) that the most successful strategies involve a limited period of assessment followed by a stable relationship in which fights are avoided and (2) that the duration of assessment depends both on the costliness of fighting and on the difference between the animals’ RHPs. Along with our direct work on modelling and simulations, we develop extensive software to facilitate further testing. It is available at https://bitbucket.org/CameronLHall/dominancesharingassessmentmatlab/.
A Physical Hand-Washing Mnemonic
An easy way to remember hand-washing procedure. pic.twitter.com/zjwnEZIq5D
— Chris Ferrie (@csferrie) March 5, 2020
(Tip of the cap to Eva Miranda.)
Wednesday, March 04, 2020
A Great 'Team' Page
Take a look at it for the short video clips!
(Tip of the cap to Carl Bergstrom.)
Sunday, March 01, 2020
Attention, Reuters: Proper Use of Colons is Important
Gosh, I hope the governor recovers soon. 🙄
— Dr. Jonathan Foley (@GlobalEcoGuy) March 2, 2020
(Reuters needs to make sure everyone on staff takes an English class.) https://t.co/Kh6KtDlUej
(Tip of the cap to Calling Bullshit.)
Update: Well, from the link (below) that Gregg Schneider just sent me, it appears that Reuters may have a writer who does not understand how to use colons properly.
Just one American with coronavirus still in hospital: Vice President Pence https://t.co/0aM9djXlEx pic.twitter.com/Zha44JLUmb
— Reuters (@Reuters) February 28, 2020
Friday, February 28, 2020
An Otter's "Careless Whisper"
For the love of god UNMUTE THIS pic.twitter.com/MA48mit8MX
— Nerd Girl Says (@Rachael_Conrad) February 23, 2020
(Tip of the cap to Card Colm Mulcahy.)
Monday, February 24, 2020
"Automatic Generation of School Bus Routes in Los Angeles"
Title: Automatic Generation of School Bus Routes in Los Angeles
Authors: Mason A. Porter, David J. Spender, and Cu Hauw ("Willy") Hung
Abstract: The goal of our project is to automatically generate school bus routes for the Los Angeles Unified School District (LAUSD). We examined four algorithms, including two from the existing literature and two new ones that we developed. A major focus of our work was the construction of “mixed-load routes,” which transport students from multiple schools. Based on our measurements (whose imperfections we discuss), three of the four algorithms perform at least as well as the existing route plan, and one of those three performs better than the existing route plan. We also delivered a user-friendly routing program to LAUSD that uses one of these algorithms, and we have made our software publicly available. Our insights and results are also applicable to other school districts that permit mixed-load routing.
Sunday, February 23, 2020
A Comic-Book Café in Korea
I want to go and hang out in this café.
(And I want to play "Take On Me" as background music while I am there.)
Saturday, February 22, 2020
Remote Login: "A Lot Like Astral Projection"
— Science Diagrams that Look Like Shitposts (@scienceshitpost) January 26, 2020
(Tip of the cap to Charles W. Clark.)
Sunday, February 16, 2020
Stay Tuned for My Mathematics Opinion Piece :)
Achievement Unlocked: I'm pretty sure that this is the first time I've felt the need to promise to an editor that I would not swear in an opinion piece that I'm going to write about mathematics.
— Mason Porter (@masonporter) February 17, 2020
Note: You should have seen the smile on my face when I was asked to write this. :P
In case you're wondering, the correct analogy (which you'll understand if you are familiar with Dragonlance) is "Tasslehoff was bored." (Nothing on Krynn is more dangerous than a bored kender.)
A sudden thought: I wonder if this counts as an Invited Tirade?
Saturday, February 15, 2020
"Contributed Tirades"
My contribution is "Contributed Tirades". I wonder if I have ever had any Invited Tirades?
Thanks to Dan Larremore for the inspiration!
Tuesday, February 04, 2020
Dodgers Acquire Mookie Betts (and David Price)!
Wow!
Update: And right after the big trade above, the Dodgers traded Joc Pederson to the Los Angeles Angels for infielder Luis Rengifo.
Update (2/09/20): After the original version of the trade hit a snag (because of a medical test on Brusdar Graterol), the Dodgers, Red Sox, and Twins have now officially agreed on a trade (so it's now a done deal). Our trades with the Red Sox and Twins are now two separate deals, and a couple of other Dodger prospects (shortstop Jeter Downs and catcher Connor Wong) are now also going to the Red Sox.
Update (2/09/20): The Dodgers also get another prospect and a draft pick from the Twins, and (according to David Schoenfield) the trade of Joc Pederson to the Angels (which apparently was contingent on the trade for Betts) appears to be a casualty of the delay in finalizing the trade for Betts.
Monday, February 03, 2020
"Online Reactions to the 2017 ‘Unite the Right’ Rally in Charlottesville: Measuring Polarization in Twitter Networks Using Media Followership"
Title: Online Reactions to the 2017 ‘Unite the Right’ Rally in Charlottesville: Measuring Polarization in Twitter Networks Using Media Followership
Authors: Joseph H. Tien, Marisa C. Eisenberg, Sarah T. Cherng, and Mason A. Porter
Abstract: Network analysis of social media provides an important new lens on politics, communication, and their interactions. This lens is particularly prominent in fast-moving events, such as conversations and action in political rallies and the use of social media by extremist groups to spread their message. We study the Twitter conversation following the August 2017 ‘Unite the Right’ rally in Charlottesville, Virginia, USA using tools from network analysis and data science. We use media followership on Twitter and principal component analysis (PCA) to compute a ‘Left’/‘Right’ media score on a one-dimensional axis to characterize Twitter accounts. We then use these scores, in concert with retweet relationships, to examine the structure of a retweet network of approximately 300,000 accounts that communicated with the #Charlottesville hashtag. The retweet network is sharply polarized, with an assortativity coefficient of 0.8 with respect to the sign of the media PCA score. Community detection using two approaches, a Louvain method and InfoMap, yields communities that tend to be homogeneous in terms of Left/Right node composition. We also examine centrality measures and find that hyperlink-induced topic search (HITS) identifies many more hubs on the Left than on the Right. When comparing tweet content, we find that tweets about ‘Trump’ were widespread in both the Left and Right, although the accompanying language (i.e., critical on the Left, but supportive on the Right) was unsurprisingly different. Nodes with large degrees in communities on the Left include accounts that are associated with disparate areas, including activism, business, arts and entertainment, media, and politics. By contrast, support of Donald Trump was a common thread among the Right communities, connecting communities with accounts that reference white-supremacist hate symbols, communities with influential personalities in the alt-right, and the largest Right community (which includes the Twitter account FoxNews).
Note: And only now after several rounds of page proofs, right after it's too late, do I notice that the typesetters changed "Right" to "right" in the paper title, even though it is a proper noun. Well, we had plenty of chances to notice this typo that they introduced, so it's frustrating that this is another one of those that I notice immediately as soon as it's published (while not catching it in my numerous chances to see it).
Tuesday, January 28, 2020
Boycotting a Coin Over a "Missing" Oxford Comma
(Tip of the cap to Sam Howison.)
Monday, January 27, 2020
"Quantifying “Political Islands” with Persistent Homology"
I finally get to share my new @TheSIAMNews article (by @michellehfeng and me): "Quantifying “Political Islands” with Persistent Homology"https://t.co/ocpZN43EHg
— Mason Porter (@masonporter) January 28, 2020
You may also be interested in our associated research article and our recent follow-up article.
Saturday, January 25, 2020
New 2020 Baseball Hall of Famers
Anyway, the new Major League Baseball Hall of Famers that were just elected by the writers are Derek Jeter (in his first year of eligibility) and Larry Walker (in his 10th and final year on the writers' ballot). I'm really pleased that Larry Walker was voted in by the writers! He should have made it years ago, but thankfully he made huge gains in each of the last three years (and especially in each of the last two years). For Jeter, the only question was whether he'd be unanimous; one person left him off of their ballot. Jeter and Walker join Ted Simmons and Marvin Miller as 2020's inductees into the Hall of Fame.
This year's vote totals are available at this website, and you can also take a look at the Hall of Fame Voter Tracker, which I was following assiduously in the weeks leading up to the announcement of the new inductees.
Scott Rolen was polling at close to 50% before the results were announced. He gained a ton of votes, but after seeing where he was before the announcement, I was a bit surprised to see the final total at "only" about 35%. Todd Helton made major gains to almost 30%, perhaps because he's no longer on his first ballot. They're in good shape, but it will take a while.
Curt Schilling got to 70%, so he'll make it in 2021. Nobody who has a shot is debuting on the ballot next year (well, maybe Tim Hudson will make it eventually), so 2021 is Schilling's year.
Rogers Clemens and Barry Bonds crept over 60%. I'll be very surprised if the writers elect them, as people have drawn lines in the sand, but one of the current incarnations of the Veterans Committees will put them in the Hall someday.
Omar Vizquel (sigh) broke the 50% barrier, and his eventual election is inevitable.
Billy Wagner, Gary Sheffield, and Andruw Jones made big gains. (I wonder if the latter two were helped not only by there being only one obvious newcomer but also by Harold Baines now being in the Hall? Both Jones and Sheffield were much better players than Baines.) We'll see how much Wagner gains over the next years.
Jeff Kent also made major inroads, and he'll likely make it eventually via one of the Veterans Committees.
A bunch of others (such as Manny Ramirez and Sammy Sosa) also gained a decent amount, but I doubt they'll go much of anywhere on the regular ballot (and Sosa has achieved around this many votes in some past years as well, I believe).
Bobby Abreu managed to get just enough votes to stay on the ballot next year. That's good.
And the latest entries in the exactly-one-vote club are Adam Dunn, Brad Penny, Raúl Ibañez, and J. J. Putz (who once hit Kevin Mench with a pitch, marking the only time in Major League Baseball history that a Mench got hit by a Putz).
There aren't any Hall-of-Fame-caliber standouts debuting on the 2021 ballot, so perhaps it will only be Curt Schilling from the regular ballot next year.
David Schoenfield wrote about this year's winners and losers in the Hall of Fame voting.
Here is my blog entry about the result of last year's writers' votes.
Wednesday, January 22, 2020
What Happens in Kuala Lumpur Stays in Kuala Lumpur
I am very tired. :)
Saturday, January 18, 2020
Quote of the Conference: Geodesic Spaces of Normal Shrinkage
This may be the quote of the conference. The talk in question is this one.
Wednesday, January 15, 2020
Tuesday, January 14, 2020
What Happens at the Joint Mathematics Meetings Stays at the Joint Mathematics Meetings (2020 Edition)
Also, here is the schedule of talks from my group (and a friend of my group).
I'm looking forward to @JointMath #JMM2020!
— Mason Porter (@masonporter) January 10, 2020
Here are talks from group members (@michellehfeng, @HZinnbrooks, Me) and a friend of the group!
See you at the meeting!https://t.co/Lzf9ykyJqZhttps://t.co/NPufVrBgpshttps://t.co/u0JtlWqyfMhttps://t.co/3wPmwBN6M9 pic.twitter.com/swQsszZdXU
Love Will Tear Us Apart: Geographic Edition
Make elevation maps of any location in the world in the style of Joy Division's Unknown Pleasures album cover (i.e. a ridgeline map) https://t.co/FQ3KSvU0FU
— kottke.org (@kottke) January 8, 2020
(Tip of the cap to Dan Anderson.)
Monday, January 06, 2020
Wednesday, January 01, 2020
A Band Called "f(x)"
Tuesday, December 31, 2019
The End of a Decade, with a Fair Starting Day
To do that, I'll first need to figure out when it started. ;)
Now, which starting point will allow me to maximize or minimize something interesting...
Oh, never mind; let's do this with a random-number generator: I get 2017.55793, which rounding to the nearest day (I'll round up), gives me a start to my decade of the 204th day of 2017.
My decade apparently started on 23 July 2017, so talk to me in 2027 about the end of my decade.
P.S. Happy New Year! (Well, in a few hours.)
Tales from the ArXiv: How Many Updates is the Record?
I wonder if 16 versions of a paper is an arXiv record?
Saturday, December 28, 2019
Social Seismology: The Chutzpah Scale
Personally, I think that we should measure chutzpah in a manner that is analogous to how we measure earthquakes.
— Mason Porter (@masonporter) December 28, 2019
Example usage: "Social seismologists are reporting that that incident registered as a 7.6 on the Chutzpah Scale, with an epicenter near Westwood." pic.twitter.com/EVQy8XUvC5
Tuesday, December 24, 2019
Emoji Differential Equations: Dreidels as Euler Angles
And in case you want a holiday-themed system of emoji differential equations, here are ones for unsteady precession of a dreidel.
— Mason Porter (@masonporter) December 25, 2019
Enjoy the holidays!
Euler angles: https://t.co/xk2jDceXZ8 pic.twitter.com/j0wV2u2AUX
Saturday, December 21, 2019
The Three Alternative Branches of Government
Parabolic, Elliptic, and Hyperbolic.
— Mason Porter (@masonporter) December 22, 2019
Fun Fact: The "Hyperbolic Branch" of government has plenty of shocks. :)
Bonus (for devotees of complex variables): Transcendental, Logarithmic, and Principal https://t.co/wly6LdMXBn
Really?
Every answer can result in a new question. — Yiddish proverb
— Yiddish Proverbs (@YiddishProverbs) December 22, 2019
Thursday, December 19, 2019
TMNTing Wikipedia Pages: A Twitter Account
Pseudo-random number samplinghttps://t.co/bTMMPJhmlL pic.twitter.com/Sh8cScM65b
— Wiki Titles Singable to TMNT Themesong (@wiki_tmnt) December 19, 2019
(Tip of the cap to Evelyn Lamb.)
Tuesday, December 17, 2019
"A Two-Patch Epidemic Model with Nonlinear Relapse"
Title: A Two-Patch Epidemic Model with Nonlinear Relapse
Authors: Juan G. Calvo, Alberto Hernández, Mason A. Porter, and Fabio Sanchez
Abstract (English version): The propagation of infectious diseases and its impact on individuals play a major role in disease dynamics, and it is important to incorporate population heterogeneity into efforts to study diseases. As a simplistic but illustrative example, we examine interactions between urban and rural populations on the dynamics of disease spreading. Using a compartmental framework of susceptible–infected–susceptible (SIŜ) dynamics with some level of immunity, we formulate a model that allows nonlinear reinfection. We investigate the effects of population movement in a simple scenario: a case with two patches, which allows us to model population movement between urban and rural areas. To study the dynamics of the system, we compute a basic reproduction number for each population (urban and rural). We also compute steady states, determine the local stability of the disease-free steady state, and identify conditions for the existence of endemic steady states. From our analysis and computational experiments, we illustrate that population movement plays an important role in disease dynamics. In some cases, it can be rather beneficial, as it can enlarge the region of stability of a disease-free steady state.
Note: The published paper also has a Spanish version of the abstract.
Monday, December 16, 2019
What Happens in Vancouver Stays in Vancouver (2019 Edition)
We'll be binge-gaming, and in particular we are going to get as far as we can through Pandemic Legacy: Season 1, which was a gift from my one of recently-finished doctoral students. (The gift actually helped provide an impetus for this trip to happen, as getting a regular set of players for a 'legacy' or other campaign is not easy for me.)
As I'll be playing a Pandemic game, I guess I won't be escaping from networks entirely. :)
Saturday, December 14, 2019
Agent-Based Models with Emoji
This may inspire some snark. Possibly.
I forgot about this thing! So much fun. Here's a little zombie simulation I threw together: https://t.co/vyn6zssehU
— Ted Aronson (@tedw4rd) December 14, 2019
(Tip of the cap to Alice Schwarze.)
Friday, December 13, 2019
Best Journal Spam E-Mail Ever?
Best predatory journal spam invite ever 🤣 pic.twitter.com/0hU7N9kauN
— Richard Sever Ⓤ (@cshperspectives) December 14, 2019
(Tip of the cap to Laura Kubatko.)
Tuesday, December 10, 2019
Tales from the ArXiv: The "Chicken McNugget Monoid"
Apparently, this comes from the standard nugget counts in boxes of Chicken McNuggets. Here is one line from the paper: Under regular integer addition, ⟨6,9,20⟩ forms a monoid, meaning the sum of any two McNugget numbers is again a McNugget number. And if this sounds like something out of The Onion, you may be interested in this recent article.
Also, in case you were wondering: Using [17, Proposition 1 and Table 1], it follows that the Frobenius number of 🐤 is 43. This is the largest number of Chicken McNuggets that cannot be ordered using whole boxes of sizes 6, 9, or 20.
"Effect of Antipsychotics on Community Structure in Functional Brain Networks"
Title: Effect of Antipsychotics on Community Structure in Functional Brain Networks
Authors: Ryan Flanagan, Lucas Lacasa, Emma K. Towlson, Sang Hoon Lee, and Mason A. Porter
Abstract: Schizophrenia, a mental disorder that is characterized by abnormal social behaviour and failure to distinguish one’s own thoughts and ideas from reality, has been associated with structural abnormalities in the architecture of functional brain networks. In this article, we (1) investigate whether mesoscale network properties give relevant information to distinguish groups of patients from controls in different scenarios and (2) use this lens to examine network effects of different antipsychotic treatments. Using various methods of network analysis, we examine the effect of two classical therapeutic antipsychotics—Aripiprazoleand Sulpiride—on the architecture of functional brain networks of both controls (i.e., a set of people who were deemed to be healthy) and patients (who were diagnosed with schizophrenia). We compare community structures of functional brain networks of different individuals using mesoscopic response functions, which measure how community structure changes across different scales of a network. Our approach does a reasonably good job of distinguishing patients from controls, and the distinction is sharper for patients and controls who have been treated with Aripiprazole. Unexpectedly, we find that this increased separation between patients and controls is associated with a change in the control group, as the functional brain networks of the patient group appear to be predominantly unaffected by this drug. This suggests that Aripiprazole has a significant and measurable effect on community structure in healthy individuals but not in individuals who are diagnosed with schizophrenia, something that conflicts with the naive assumption that the drug alters the mesoscale network properties of the patients (rather than the controls). By contrast, we are less successful at separating the networks of patients from those of controls when the subjects have been given the drug Sulpiride. Taken together, in our results, we observe differences in the effects of the drugs (and a placebo) on community structure in patients and controls and also that this effect differs across groups. From a network-science perspective, we thereby demonstrate that different types of antipsychotic drugs selectively affect mesoscale properties of brain networks, providing support that structures such as communities are meaningful functional units in the brain.
Monday, December 09, 2019
"Customer Mobility and Congestion in Supermarkets"
Title: Customer Mobility and Congestion in Supermarkets
Authors: Fabian Ying, Alisdair O. G. Wallis, Mariano Beguerisse-Díaz, Mason A. Porter, & Samuel D. Howison
Abstract: The analysis and characterization of human mobility using population-level mobility models is important for numerous applications, ranging from the estimation of commuter flows in cities to modeling trade flows between countries. However, almost all of these applications have focused on large spatial scales, which typically range between intracity scales and intercountry scales. In this paper, we investigate population-level human mobility models on a much smaller spatial scale by using them to estimate customer mobility flow between supermarket zones. We use anonymized, ordered customer-basket data to infer empirical mobility flow in supermarkets, and we apply variants of the gravity and intervening-opportunities models to fit this mobility flow and estimate the flow on unseen data. We find that a doubly-constrained gravity model and an extended radiation model (which is a type of intervening-opportunities model) can successfully estimate 65%–70% of the flow inside supermarkets. Using a gravity model as a case study, we then investigate how to reduce congestion in supermarkets using mobility models. We model each supermarket zone as a queue, and we use a gravity model to identify store layouts with low congestion, which we measure either by the maximum number of visits to a zone or by the total mean queue size. We then use a simulated-annealing algorithm to find store layouts with lower congestion than a supermarket’s original layout. In these optimized store layouts, we find that popular zones are often in the perimeter of a store. Our research gives insight both into how customers move in supermarkets and into how retailers can arrange stores to reduce congestion. It also provides a case study of human mobility on small spatial scales.
Sunday, December 08, 2019
Tales from the ArXiv: Modeling Stupid People
Here is a screenshot to whet your appetite.
Marvin Miller and Ted Simmons are in the Hall of Fame!
I look forward to seeing people like Lou Whitaker eventually get in as well!
(Given the Harold Baines debacle from last year, there was basically no chance for me to be as annoyed about the 'Veterans Commitee' selections as I was last year at this time.)
Update: The article above has now been updated with the vote totals. Simmons got 13 votes and Miller got 12, and Dwight Evans was next with 8. The rest of the vote totals are as follows: "Dave Parker received seven votes, and Steve Garvey and Lou Whitaker six each. Tommy John, Don Mattingly, Thurman Munson and Dale Murphy all got three or fewer."
Saturday, December 07, 2019
Karate Clubbuccino (Take 2)
Karate Clubbuccino, take 2.
— Mason Porter (@masonporter) December 7, 2019
(Thanks to Sofia Piltz for making this happen.) pic.twitter.com/Gi0vMbfNQs
Below is take 1.
In case you ever wanted to see the Karate Club network visualized using a capuccino embedding.
— Mason Porter (@masonporter) November 10, 2019
(Thanks to University of Michigan postdoc Sofia Piltz for trying this out for me at BeanBerry Cafe in Ann Arbor. She'll try it with a higher-contrast and more circular picture later.) pic.twitter.com/nqLpcJrfmY
Friday, December 06, 2019
The Devil's Mathematical Dictionary
Inspired by a comment in today's presentation, my new goal is to write a mathematics paper that uses the "Feeling" environment.
— Mason Porter (@masonporter) December 7, 2019
(This, in turn, inspired the present document. I decided to do this in a style akin to that of the Devil's Dictionary.) pic.twitter.com/UzpWKjQRRV
Thursday, December 05, 2019
A Black Box with Weights on the Inside
Stitchfix algos did white elephant where we had to put a clue on the outside. So I made a black box with weights inside pic.twitter.com/Uc7dC2BElM
— Dr. Donut ☕️ (@BEBischof) December 6, 2019
(Tip of the cap to Adrienne Porter Felt [no relation].)
A Very Cool Science Cake about Soil
Because someone had to do it. 🔼
— Karen Vaughan (@vaughan_soil) December 5, 2019
Thanks to all the students and faculty who helped bake cakes! I’ll share the assembly video below. #WorldSoilDay pic.twitter.com/pOtnyMHPgc
(Tips of the cap to Anne Jefferson and Meghan Duffy.)
Thursday, November 28, 2019
My TDA (Topological Data Analysis) Origin Story
During one of my daily arXiv routines, I noticed a paper by Konstantin and collaborators that used topological data analysis (TDA), so I saw that we were looking at the same systems, but in different ways. I contacted him, visited him early in 2013, and we started a joint TDA project --- but it turned out to be on spreading dynamics on networks, rather than on granular networks. Our first paper (which was led by Dane Taylor and coauthored with many other excellent people, including my Oxford colleague Heather Harrington) was published in final form in Nature Communications in 2015. I viewed this as just one paper; I never intended to start a large new direction in my research program. Back at Oxford, one student saw that I was part of that and wanted to work with Heather and me on applications of TDA. Then more students saw the 2015 paper and what this student was doing, and they wanted to work with us on TDA.
After I moved to UCLA, more students (starting with Michelle Feng) saw that I had some papers on TDA and wanted to work with me on those topics, partly because they wanted to do things with applications but also wanted to continue pursuing more theoretical mathematical subjects as well. I also really like the idea of taking "traditionally pure" areas of mathematics and bringing more and more of them into applications. It's a really exciting thing to do. And the work on applications also yields really great insights into the mathematical theory. (Because it does go in both directions, after all.)
Most recently, at least among people who have officially joined my group, Abby Hickok saw the work that Michelle and I have been doing, and she has ideas for building further on that work. And now TDA (along with work involving the intersection of dynamics, networks, and simplicial complexes) has become an important part of my research program,
Anyway, it was an all an accident.
Wednesday, November 27, 2019
Facial Recognition Software for Sheep
Okay... pic.twitter.com/Qbsm6yptuH
— Thomas Lumley (@tslumley) November 27, 2019
(Tip of the cap to Richard Parker.)
A Golden Age of Mathematics: Happening Right Now!
My opinion is that we are, right now, in a golden age of mathematics.
— Mason Porter (@masonporter) November 27, 2019
I really like the quote below, and that's what I try to convey to my students and postdocs. https://t.co/EDt196FML9 pic.twitter.com/MmkbY28HN6
Monday, November 25, 2019
Tales from the ArXiv: Mathematics Paper or Science-Fiction Novel?
Tropical PCA sounds very promising and fascinating. Additionally, I think the title of this paper would make a great title for a science-fiction novel.
Saturday, November 23, 2019
Data Analysis of Exuberant and Uncouth College Fight Songs
UCLA's fight song is apparently called "Sons of Westwood" (ugh).
How can they write such an article without mentioning Tom Lehrer?
Friday, November 22, 2019
Tetris with Gelatin
Jelly Tetris pic.twitter.com/fVMuMyrHd3
— Universal Curiosity (@UniverCurious) November 22, 2019
Wednesday, November 20, 2019
Some of my Past Materials Related to Academic Job Applications and Related Things
In case it's of interest to those of you on the academic job market (or people with mentees on the market), I have posted some of my materials: (1) a research statement; (2) a teaching statement; and (3) two equity, diversity, and inclusion statements: https://t.co/HDMKUPNTvF
— Mason Porter (@masonporter) November 20, 2019
It's Applied-Mathematician Season
https://t.co/c0u86Szfc9 pic.twitter.com/6I1rK9viu6
— Conor Finn (@Conor_Finn) November 20, 2019
Tuesday, November 19, 2019
AirBnB Rental of a Pirate Ship on the Mississippi River
Monday, November 18, 2019
LaTeX Without Hats
This is what we're supposed to do with this LaTeX package, right?
— Mason Porter (@masonporter) November 19, 2019
cc: @MenWithoutHats1 https://t.co/zBVHpjZ9qB pic.twitter.com/e3WGYXF9Cg
Note: I think that the official lyrics have "We can..." in the first line that I show, but when Men Without Hats sing it, it does sound somewhat like they include an extra de facto syllable.
Update (11/19/19): I did a copy-and-paste and clearly should have looked a bit more for a better website. I didn't even notice the "They're are" until I saw Ernie Barreto's comment on Facebook. Here is a better site.
Sunday, November 17, 2019
Friday, November 15, 2019
Thursday, November 14, 2019
2019 Most Valuable Player Awards
You can find the vote tallies of all players who received MVP votes on this page, and you can take a look at ESPN's summary of this season's awards in Major League Baseball on this page.
Wednesday, November 13, 2019
2019 Cy Young Awards
You can read ESPN's summary of this week's Major Baseball Awards on this page.
Tuesday, November 12, 2019
2019 Managers of the Year
ESPN is tabulate this week's award winners on this page.
Monday, November 11, 2019
Tales from the ArXiv: "Tautological Algebra"
2019 Rookies of the Year
Take a look at this page for a tabulation of Major League Baseball's 2019 awards. Today's announcement of the Rookies of the Year kicks off a week of pronouncements. The three finalists for each award were announced previously.
Update: The vote tallies are available at this page.
Sunday, November 10, 2019
Paper Title of the Day: "p-ing Everywhere"
The sort of paper title that one ultimately regrets, I think. pic.twitter.com/g19H4yTdn7
— Stuart Ritchie (@StuartJRitchie) November 10, 2019
(Tip of the cap to Chris Marcum.)
Saturday, November 09, 2019
Visualization of the Zachary Karate Club Network Using a Cappuccino Embedding
In case you ever wanted to see the Karate Club network visualized using a capuccino embedding.
— Mason Porter (@masonporter) November 10, 2019
(Thanks to University of Michigan postdoc Sofia Piltz for trying this out for me at BeanBerry Cafe in Ann Arbor. She'll try it with a higher-contrast and more circular picture later.) pic.twitter.com/nqLpcJrfmY
Sofia found this picture in one of Petter Holme's presentations, although it reminds me of one of them from old papers and t-shirt designs.
Wednesday, November 06, 2019
Tales from the ArXiv: An Epic 1-Panel Figure
Monday, November 04, 2019
"Supracentrality Analysis of Temporal Networks with Directed Interlayer Coupling"
Titles: Supracentrality Analysis of Temporal Networks with Directed Interlayer Coupling
Authors: Dane Taylor, Mason A. Porter, and Peter J. Mucha
Abstract: We describe centralities in temporal networks using a supracentrality framework to study centrality trajectories, which characterize how the importances of nodes change in time. We study supracentrality generalizations of eigenvector-based centralities, a family of centrality measures for time-independent networks that includes PageRank, hub and authority scores, and eigenvector centrality. We start with a sequence of adjacency matrices, each of which represents a time layer of a network at a different point or interval of time. Coupling centrality matrices across time layers with weighted interlayer edges yields a supracentrality matrix ℂ(𝜔), where ω controls the extent to which centrality trajectories change over time. We can flexibly tune the weight and topology of the interlayer coupling to cater to different scientific applications. The entries of the dominant eigenvector of ℂ(𝜔) represent joint centralities, which simultaneously quantify the importance of every node in every time layer. Inspired by probability theory, we also compute marginal and conditional centralities. We illustrate how to adjust the coupling between time layers to tune the extent to which nodes’ centrality trajectories are influenced by the oldest and newest time layers. We support our findings by analysis in the limits of small and large ω.
Sunday, November 03, 2019
7th Century: Service Obligations Interfering with Research and Teaching
Academics complaining that departmental service obligations interfere with their research and teaching. Assyria, mid 7th century BC: pic.twitter.com/SCkmgFk8by
— Christopher Jones (@cwjones89) November 2, 2019
(Tip of the cap to multiple people.)
Friday, November 01, 2019
"Challenge Accepted"
Challenge accepted. pic.twitter.com/JxM5XhB28D
— You Had One Job (@WayThingWorks) November 2, 2019
(Tip of the cap to Card Colm Mulcahy.)











