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.

What Happens in Vancouver Stays in Vancouver (2024 Edition)

I'm going to Vancouver to visit friends!

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

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

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.

"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.