Showing posts with label rankings. Show all posts
Showing posts with label rankings. Show all posts

Sunday, January 16, 2022

The `PrickRank' Algorithm

One way to gather information is to purposely write an incorrect 'factual' statement on social media.

People love to correct others (often obnoxiously, but at least one acquires info).

Google has PageRank, and social-media platforms like Twitter have this `PrickRank algorithm'.

(This monicker is destined to become a classic, just like FIPO.)

Tuesday, August 23, 2016

Tales from the ArXiv: Iterated Agony Edition

The last sentence of this paper is priceless: We analytically characterize the detectability threshold and we show that an iterated version of agony can partly overcome this resolution limit.

Thursday, November 26, 2015

Ranking Scientists According to Sarcasm

"Instead of using citations, I think we should rank scientists from most sarcastic to least."

Naturally, I was accused of using my own CV after I proposed that criterion for measuring quality.

Maybe I should call this metric the "p-index"? We could call it the "s-index", if you prefer, but then I wouldn't be naming it after myself.

Monday, September 22, 2014

Monday, February 18, 2013

Tales from the ArXiv: Baby Names and Random Walks

Well, how about that: using things like PageRank and other random-walk algorithms to come up with baby names. It's crazy, but I kind of dig it. :) Also, I these somebody wants an Ig Nobel prize (in Peace?)...

You can try it for yourself at the Nameling website.

Sunday, October 02, 2011

Monkey Rankings: Back for 2011

The monkey rankings (aka: random walker rankings) are back for 2011.

Through games of 1 October, we have Clemson at #1 for most parameter values.

Wednesday, January 12, 2011

Best and Worst Jobs of 2011

Mathematician was named the 2nd best job of 2011. Software engineer was first. And perhaps that is indeed true, but mathematicians are much cooler than software engineers! [He says as he ducks a lot of virtual tomatoes.]

Check out the 3rd worst job. I always thought that they were ok.

(Tip of the cap to SIAM.)

Sunday, October 10, 2010

The Monkey Rankings are Back!

Now you can start seeing how the monkeys (aka, random walkers) are doing in their attempt to rank college football teams.

Monday, December 14, 2009

"Mutually-Antagonistic Interactions in Baseball Networks"

We interrupt this fixation on student interviews (as well as the 2000 extra special taxes that the UK government wants to charge me---hopefully incorrectly) for the following news bulletin:

My baseball networks article has now officially appeared in print. Because of the journal's printed backlog, it's actually in issue number 5 of a 2010 volume, but anyway it has official page numbers now, so it's time to link to my paper in this spot.

Title: Mutually-Antagonistic Interactions in Baseball Networks

Authors: Serguei Saavedra, Scott Powers, Trent McCotter, Mason A. Porter, Peter J. Mucha

Abstract: We formulate the head-to-head matchups between Major League Baseball pitchers and batters from 1954 to 2008 as a bipartite network of mutually-antagonistic interactions. We consider both the full network and single-season networks, which exhibit structural changes over time. We find interesting structure in the networks and examine their sensitivity to baseball's rule changes. We then study a biased random walk on the matchup networks as a simple and transparent way to (1) compare the performance of players who competed under different conditions and (2) include information about which particular players a given player has faced. We find that a player's position in the network does not correlate with his placement in the random walker ranking. However, network position does have a substantial effect on the robustness of ranking placement to changes in head-to-head matchups.


And, of course, it's always good to be able to discuss Bert Blyleven in one of my research papers. He better get elected to the Hall of Fame in 2010, damnit!

Sunday, September 27, 2009

Return of the Random Walkers (2009 edition)

There have now been enough games in the 2009 college football season for the 'monkey rankings' (i.e., random walker rankings) to be calculated. (AKA: The relevant adjacency matrix now satisfies the Perron-Frobenius theorem, but never mind...) Our rankings are never good this early in the season, but you can still go to my collaborator's blog (i.e., the link above) and yell at him about the rankings. :) The basic way that the rankings work is explained on that page.

Thursday, August 06, 2009

Taking Over the Blogosphere (well, not really, but it's a dream)

The baseball networks story has been picked up by the Freakonomics Blog.


It's also been picked up by a few baseball/sabermetrics blogs, including a couple of them that are hosted by prominent people in the business. Ones that have followed up on the Wired story include 27pitches.com, The
Book--Playing The Percentages In Baseball
, Baseball Musings, and Baseball Think Factory.

I wonder if my dreams of being made fun of on SportsCenter (or at least by Bill James) will come true? ;)


The story has also been picked up by USA Today online and reached #4 on digg.com in the category of sports for a 24-hour period. As usual, the comments in the various venues have included a mixture of intelligent ones and not-so-intelligent ones. (The ones on the sabermetrics blogs have been almost uniformly great. Some of those folks have looked at our actual paper and not just the Wired article and have given some very nice academic-style food for thought regarding some things we might want to consider rephrasing in the paper when it is back on our desks. That is much appreciated!) I especially "love" the ones that expressed extreme moral indignation about some combination of (1) not incorporating PED information into our rankings, (2) not using data to which we just don't have access, or (3) not coming up with results that match their preconceptions. (Um, science isn't automatically wrong if it doesn't give the answer for which you were hoping and/or expecting!)

Oh, and I haven't gotten as much work done during the last couple of days as I was hoping... I really need to work on my scholarpedia article about solitons.

Tuesday, January 06, 2009

"Mathematician" named top job in a America

I just found out from an AMS press release that "mathematician" is the top job in the United States according to the Wall Street Journal.

That's what I've been saying all along. I told you so!


Here are the best and worst jobs according to the article:


The Best
1. Mathematician
2. Actuary
3. Statistician
4. Biologist
5. Software Engineer
6. Computer Systems Analyst
7. Historian
8. Sociologist
9. Industrial Designer
10. Accountant


The Worst
200. Lumberjack
199. Dairy Farmer
198. Taxi Driver
197. Seaman
196. EMT
195. Garbage Collector
194. Welder
193. Roustabout
192. Ironworker
191. Construction Worker



The article showed the top 20 and bottom 20 jobs. Most of the top jobs are typically quite academic in flavor, although I was amused by the fact that physicist (13th) ranked just above parole officer (14th). I approve!

Sunday, November 30, 2008

Random Walker Rankings: The Blog

As many of you know, Peter Mucha, Thomas Callaghan and I produced the random walker ranking system for ranking college football teams several years ago. Here are our 2008 rankings right now.

In order to open discussion with people who read the project's web page, we are adding a Random Walker Ranking blog. Naturally, I have added this to my blogroll.

Sunday, October 05, 2008

Ranking universities using polytopes

Courtesy Peter Mucha, here is an article in Science News covering a new arXiv paper by Peter Huggins and Lior Pachter that uses polytopes to examine the US News and World Report rankings of US universities. (Some of you may be aware that Lior Pachter is yet another Techer. He was a Rudd, who I believe graduated in 1994. He's currently on the faculty at UC Berkeley and is one of the pioneers in the new field of "applied algebraic statistics." Actually, algebraic statistics is pretty much a new field of mathematics even before one considers applications.)

One of the ideas I've been bouncing around for several years is the idea of using network science to rank universities. One of these days I'll do that... (My current ranking system project, by the way, involves ranking baseball players using the bipartite graph of pitcher-batter interactions. My collaborators and I don't have any results yet, but stay tuned...)

Saturday, October 04, 2008

2008 Random Walker Rankings

They're baaaaaaack.

By now, I assume that most of you know that this ranking system is for NCAA American Football. You can see how our systems (RW and RWFL) are doing on Kenneth Massey's comparisons page.

Thursday, November 15, 2007

Random walker rankings back in the news

The random walker U.S. college football rankings I helped develop are back in the news. (Actually, the author of the piece, Ivars Peterson, has written about our ranking system before, as you can see by scrolling down the page and looking at the references.)

This is actually nothing compared to past instances of media sluttage. The football ranking system alone has been picked up by such glorious venues like Nature Science Update, The Washington Post, CNN Headline News, and (most important) ESPN: The Magazine. You can find links to many of those articles using the link I provided.

In other media news, the AMS Mathematical Moment based on one of my expository articles has now been translated into Polish. It was already available in English, Chinese, French, German, Japanese, Portuguese, Russian, and Spanish.

Thursday, November 08, 2007

Random Walker Ranking for NCAA Division I-A Football

Hey, guess what paper finally came out yesterday? That's right, I just received a .pdf reprint of the original random walker rankings paper that my collaborators (Peter Mucha, Thomas Callaghan, and I) first submitted to American Mathematical Monthly in November 2003.

For those of you who don't know the gory details behind getting this paper published, that is not a typo. It took 4 fucking years! Moreover, the paper was never even rejected so it's not like it bounced from one journal to another. The Monthly was the only journal to which we ever submitted this. We first had to revise the paper after getting referee reports 6 months after submission (which is much longer than most journals where I submit stuff). Then we spent a good period of time over the next year addressing the extensive comments (which required a lot of new analytical and numerical work), and then once we resubmitted the paper, we didn't hear anything for 6-8 months only to find out that the referee who wanted that stuff done in the first place was completely AWOL. (The other referee was already extremely pleased with the whole endeavor, and the referee who complained insisted on certain things that were technically in direct contradiction to some of the stuff on the Monthly's masthead in terms of what article formats and content were acceptable.) Then a new referee had to be found (and then that guy had comments too) although by that point (mid 2005) the paper was guaranteed to be accepted once we addressed the points of the third referee (some of which were a request to make certain aspects of the paper more like the version we had submitted in the first place). The paper then got officially accepted in early 2006 (I think in February) although the Monthly does an extensive mark-up of papers, so we exchanged some iterations to deal with small changes that indicated various degrees of fastidiousness on the part of the editor. Then the paper got put in a queue for when it would be finally published. It didn't make it out in 2006 because of the journal's huge backlog and then when a new editor took the reigns of that journal in 2007, he found additional points that he wanted us to tweak even after the so-called "final" version had been approved by the previous editor. We dealt with those in 2007, did the usual deal with page proofs, and waited a bit more for the journal's backlog to run its course a bit so that our paper could finally be officially in print. Then we got our .pdf file of the reprint yesterday, so this paper is finally out.

I should also mention that leaving aside the considerable extra effort that the journal required of us, the final paper was improved considerably as a result of all those shenanigans. It was often quite painful and frustrating (and I still maintain that the journal didn't handle our paper appropriately), but as good as the original version of the paper was (you can find that on the arxiv by looking at the paper's posting history), the final version is considerably better. And now that the pain from this tribulation has faded away, I am not as bitter towards the Monthly as I used to be and I am even considering eventually submitting another paper to it (though I hope that my collaborators will talk me out of it the next time I make that suggestion, because a 4 year gap is just absurd even if the chosen journal truly is the optimal one for this paper, which I believed when I first suggested we submit to the Monthly and which I still believe now).

Now, I have discussed this work on this blog in a good amount of detail before. So, I will defer to the paper to which I linked above, the expository paper my collaborators and I wrote for the Notices of the AMS, and (of course) the project's home page.

So, with this long, ranty preamble out of the way, I hereby dedicate to the editors and referees of the Monthly (which, in my opinion, seems to be somewhat of an inbred journal in terms of who the referees are and how blindly the editors seem to trust them) this partial list of some of the events that have transpired in the 4 years since my coauthors and I originally submitted this paper for publication in November 2003:

1. The three authors of this paper have undergone a total of four institution changes. (Thomas Callaghan started out as a junior in college and is now in his third year in the applied math doctoral program at Stanford. Peter Mucha was an assistant professor at Georgia Tech and is now an associated professor at UNC Chapel Hill. I was a postdoc at Georgia Tech, and then a postdoc at Caltech, and now a faculty member at Oxford.)

2. Peter and I both have much more than twice as many publications as we did in November 2003. In fact, I have more than 3 times as many publications as I did back then and Peter may have that as well.

3. Peter has twice as many children as he did then and his older child is over twice as old as he was in November 2003. (We need to stop using those pictures of him when we include this topic in seminars that we give. He's probably already embarrassed by the fact that all of our colleagues have seen this particular picture from his infancy at all these conferences.)

4. Thomas was part of the first batch of 5 undergraduate students I advised or co-advised on a serious project. I have now advised/co-advised close to 30 undergraduates.

5. At least one of my undergraduate research advisees is now married, and many of them are now in Ph.D. programs. (If you'll excuse a little bit of bragging, this includes 1 person at Harvard, 3 at Stanford, and 1 at Cornell.)

6. Most of the college freshman from fall 2003 have now graduated.

7. When we submitted this article, Facebook hadn't yet launched. (It launched on February 4th, 2004.)

8. Since we submitted the article, the Chicago White Sox won their first World Series in more than 80 years.

9. So did the Boston Red Sox. And then the Red Sox won a second World Series three years later. (During this year's postseason, I knew this paper was coming out imminently and I was actively rooting for the paper to come out after the World Series just so this comment would be even better.)

10. Since we submitted this article, the Caltech men's basketball team won its first game in over 10 years.

11. The Caltech women's basketball team won its first two games ever.

12. The video game systems that have come out since we submitted our paper include (at least) the Wii, XBOX 360, PS 3, and two versions of the Nintendo DS. (But Duke Nukem Forever still hasn't come out, and I was supposed to be a secret character in that game! OK, that was a private joke between me and one of my friends who was working on that game back in the day and I don't know if that would really have seen the light of day. But still...)

13. My first book was published. (I started it in May 2003, so I can't say I started it after we submitted this paper.) I also served as the mathematical consultant for a movie.

14. I started blogging (in October 2005).

15. Back when we first submitted this paper, George W. Bush was President of the United States. Oh fuck, he still is.

16. Division I-A isn't even called "Division I-A" anymore. It's now called "FBS" and "Division I-AA" is now called "FCS". (Just to screw with us more, "Division II" and "Division III" have retained their old names.) Hence, the terminology in our article's title is technically now incorrect. (This change occurred after we were done with the page proofs.)



I think there was more that I wanted to mention. Maybe I'll add some other amusing things to the comments if I think of them.