Sunday, March 16, 2025

What Happens at the Global Physics Summit Stays at the Global Physics Summit

Later this afternoon, I will be taking a train to Anaheim to go to the Global Physics Summit, where I will be participating in the March-Meeting wing of this summit. I'll only be around for about a day and a half or so, but nevertheless I will be making my triumphant return to the March Meeting (which I last attended in 2016).

Update: I ended up just taking a Lyft directly to my hotel and not bothering with the train.

Thursday, February 06, 2025

What Happens in the Research Triangle Stays in the Research Triangle (2025 Edition)

I am flying over to the Research Triangle in North Carolina to give talks at NC State and UNC Chapel Hill and also to talk shop with some of my collaborators.

Thursday, January 30, 2025

“An “Opinion Reproduction Number” for Infodemics in a Bounded-Confidence Content-Spreading Process on Networks”

One of our papers was published in final form today. Here are some details.

Title: An “Opinion Reproduction Number” for Infodemics in a Bounded-Confidence Content-Spreading Process on Networks

Authors: Heather Z. Brooks and Mason A. Porter

Abstract: We study the spreading dynamics of content on networks. To do this, we use a model in which content spreads through a bounded-confidence mechanism. In a bounded-confidence model (BCM) of opinion dynamics, the agents of a network have continuous-valued opinions, which they adjust when they interact with agents whose opinions are sufficiently close to theirs. Our content-spreading model, which one can also interpret as an independent-cascade model, introduces a twist into BCMs by using bounded confidence for the content spread itself. We define an analog of the basic reproduction number from disease dynamics that we call an opinion reproduction number. A critical value of the opinion reproduction number indicates whether or not there is an “infodemic” (i.e., a large content-spreading cascade) of content that reflects a particular opinion. By determining this critical value, one can determine whether or not an opinion dies off or propagates widely as a cascade in a population of agents. Using configuration-model networks, we quantify the size and shape of content dissemination by calculating a variety of summary statistics, and we illustrate how network structure and spreading-model parameters affect these statistics. We find that content spreads most widely when agents have a large expected mean degree or a large receptiveness to content. When the spreading process slightly exceeds the infodemic threshold, there can be longer dissemination trees than for larger expected mean degrees or receptiveness (which both promote content sharing and hence help push content spread past the infodemic threshold), even though the total number of content shares is smaller.

Tuesday, January 21, 2025

Ichiro Suzuki, CC Sabathia, and Billy Wagner Elected to the Hall of Fame

Ichiro Suzuki, CC Sabathia, and Billy Wagner have been elected to Major League Baseball's Hall of Fame. They join Dick Allen and Dave Parker, who were elected to the Hall by one of the era committees in December.

As one can see in the voting results, Suzuki was named on every ballot except for one. (Therefore, Mariano Rivera remains the only player who has ever been elected to the Hall unanimously by the baseball writers.) Suzuki and Sabathia are both in their first year of eligibility, and Billy Wagner is in his 10th and final year of eligibility. I initially thought that Sabathia would get about 50% of the vote in his first year, but I saw quickly from the vote tracker (which I follow religiously every year) that he was going to make it this year. For Suzuki, the only question is whether or not he'd be elected unanimously. Wagner missed election last year by a measly 5 votes, so it was clear that he'd make it this year.

The strong election of Sabathia, the stronger-than-I-expected debut of Féliz Hernández (who got 20.6% of the vote), and the big gains of Andy Pettite (who roughly doubled his vote percentage from last year to 27.9% after making essentially no progress for several years) illustrate that the writers are looking much more intelligently than they used to at what constitutes a Hall-of-Fame starting pitcher.

Carlos Beltrán made a lot of progress to reach 70.3% of the vote. The newcomers on the 2026 ballot constitute a weak field, so Beltrán will surely be elected in 2026 and the other holdovers should make strong progress. Andruw Jones improved a little bit to 66.2%, and he may well be elected next year. I think it's about 50/50 that Jones gets elected in 2026 — a selection of ESPN baseball writers are much more optimistic than I am — but I am confident that he'll make it in 2027 (his 10th and final year of eligibility) if he does not make it in 2026. Jones barely survived the 5% cut on the ballot in his first couple of years, so he's made a ton of progress since then. Chase Utley also made a lot of progress this year, going from 28.8% of the vote to 39.8% of it. I expect that he will surpass 50% next year, but I think that he's likely still a few years from election.

Update: Here is Jay Jaffe's post to summarize the voting results and his thoughts on them. The navigation bar at the top of that website gives hyperlinks to his other articles for the 2025 Hall of Fame voting cycle.

Update (1/23/25): Here is Jay Jaffe's extended rundown of the election results.

Update (1/27/25): Here is Jay Jaffe's 5-year forecast of upcoming Hall of Fame elections.

Friday, January 17, 2025

What Happens in Athens (Georgia) Stays in Athens (Georgia)

I am heading off to Athens for my niece's bat mitzvah. Maybe I will see some homage to the Athens music scene at some point?

Thursday, January 16, 2025

RIP Bob Uecker (1934–2025)

Former player, Brewer broadcaster, and legendary baseball personality Bob Uecker has died.

One of the great things when Baseball started broadcasting games over the internet many years ago is that I got a chance to hear Uecker broadcast a bunch of games. He was damn funny, an amazing broadcaster and storyteller, and a lifetime .200 hitter (as he sometimes pointed out with his wonderful self-deprecating humor).

You can read more about Uecker at his Wikipedia page.

Friday, January 10, 2025

What Happens in San Juan Capistrano Stays in San Juan Capistrano (Wildfire Edition)

UCLA is officially still online on Monday, so I am heading over to visit friends in San Juan Capistrano for an unplanned visit. If we are teaching in person on Wednesday, I will return on Tuesday. Otherwise, I will return at some later time.

Additionally, as in games like Pandemic, the regions of 'evacuation warning' (in this case) are also getting closer to my home region, so it's good to get out of town when it's prudent.

Update (maybe 20 minutes after I wrote the text above, with a scheduled posting for tomorrow afternoon): Then again, it looks like the Pacific Palisades wildfire has taken a hard east (though somewhat north of me) with some regions going from nothing to warning to GTFO very quickly. My region doesn't yet have even a warning, but the prudect act is to GTFO tonight and go to my friends already.

Thursday, January 02, 2025

What Happens in Denver Stays in Denver (2025 Edition)

I am flying to Denver for the US Dynamics Days 2025 conference. I really love this conference series! This year, the conference hotel is actually about half a mile from the 2025 Snowbird-conference hotel.

I am really looking forward to this year's Dynamics Daze conference!

Saturday, December 21, 2024

RIP Rickey Henderson (1958–2024)

One of Baseball's all-time legends — both in terms of on-field performance (Wow!) and in terms of the many awesome stories — has left us. Inner-circle Hall of Famer Rickey Henderson has died.

You can read about his career, his personality, and a couple of his unreachable Major League records in this article. This article has a collection of 25 great stories (most of them true), and this article has a collect of 10 great instances of Rickey talking about Rickey in the third person. (There is some overlap in the stories in these two collections.)

As Tom Verducci wrote in 2003, "There are certain figures in American history who have passed into the realm of cultural mythology, as if reality could no longer contain their stories: Johnny Appleseed. Wild Bill Hickok. Davy Crockett. Rickey Henderson. They exist on the sometimes narrow margin between Fact and Fiction."

Rest in peace, Rickey.

Monday, December 16, 2024

Wednesday, December 11, 2024

What Happens in Cambridge (Massachusetts) Stays in Cambridge (Massachusetts)

I am flying out to Boston to give a System Dynamics seminar at MIT.

Sunday, December 08, 2024

Dick Allen and Dave Parker Elected to the Baseball Hall of Fame

Dick Allen and Dave Parker have been elected to the baseball Hall of Fame. I strongly support Dick Allen's election (which is long overdue), but I don't think that Parker should be in the Hall of Fame. (In my view, he belongs instead to the Hall of Very Good.)

Of the people on this particular Veterans Committee ballot (though the name "Veterans Committee" was retired many years ago), I was most enthusiastic about Dick Allen's candidacy. I also think that Luis Tiant, Vic Harris, and Ken Boyer belong in the Hall of Fame. Jay Jaffe has written excellent summaries of the careers and Cooperstown (i.e., Hall of Fame) cases of the people on the ballot.

Tuesday, December 03, 2024

"Dynamical Importance and Network Perturbations"

One of my papers was just published in final form. Here are some details.

Title: Dynamical Importance and Network Perturbations

Authors: Ethan Young and Mason A. Porter

Abstract: The leading eigenvalue λ of the adjacency matrix of a graph exerts much influence on the behavior of dynamical processes on that graph. It is thus relevant to relate notions of importance of network structures to λ and its associated eigenvectors. We study a previously derived measure of edge importance known as “dynamical importance,” which estimates how much λ changes when one removes an edge from a graph or adds an edge to it. We examine the accuracy of this estimate for several undirected network structures and compare it to the relative change in λ after an edge removal or edge addition. We then derive a first-order approximation of the change in the leading eigenvector. We also consider the effects of edge additions on Kuramoto dynamics on networks, and we express the Kuramoto order parameter in terms of dynamical importance. Through our analysis and computational experiments, we find that studying dynamical importance can improve understanding of the relationship between network perturbations and dynamical processes on networks.

Wednesday, November 27, 2024

What Happens in San Juan Capistrano Stays in San Juan Capistrano (2024 Edition)

I am in San Juan Capistrano gaming and hanging out with friends for the long weekend.

Thursday, November 21, 2024

2024 Most Valuable Player (MVP) Awards

Major League Baseball has announced the winners of the 2024 Most Valuable Player (MVP) awards. See this page for the complete distribution of votes.

Aaron Judge of the New York Yankees was the unanimous MVP in the American League, with Bobby Witt Jr. of the Kansas City Royal receiving all 2nd-place voters. (I believe that the latter has never happened before.) The American League also had several other very strong candidates in an exceptional field. In the National League, Shohei Ohtani of the Los Angeles Dodgers was the unanimous MVP. This was his third unanimous MVP. Nobody else in Major League Baseball history has won multiple MVP awards unanimously.

Wednesday, November 20, 2024

2024 Cy Young Awards

Baseball's 2024 Cy Young awards were announced today. Chris Sale of the Atlanta Braves won in the National League, and Tarik Skubal was a unanimous winner in the American League.

Tuesday, November 19, 2024

2024 Baseball Managers of the Year

The 2024 Managers of the Year in Major League Baseball are Stephen Vogt of the Cleveland Guardians and Pat Murphy of the Milwaukee Brewers.

Monday, November 18, 2024

2024 Baseball Rookies of the Year

The 2024 Rookies of the Year were announced today. Paul Skenes of the Pirates was the winner of an exceptionally strong rookie class (beating out the two Jacksons) in the National League, and Luis Gil of the Yankees was the winner (barely winning over Colton Cowser of the Orioles) of a much weaker rookie class in the American League.

Thursday, November 14, 2024

Various Major League Baseball Awards

Various Major League Baseball awards were announced today. These awards include the Comeback Players of the Year — which were Garrett Crochet in the American League and Chris Sale in he National League — and several others.

The more significant awards — Most Valuable Player, Cy Young award, Rookie of the Year, and Manager of the Year — will be announced next week. The three finalists for each award in each league were announced recently.

Tuesday, November 12, 2024

2024 Silver Slugger Awards

Major League Baseball has announced its 2024 Silver Slugger Awards. You'll noticed a few Dodgers among the awardees. :)