David Gerth

@davidgerth5.bsky.social

The last couple of weeks have really affirmed that video can’t work if authorities have decided they’re not bound by anything, least of all reality. Rodney King and Latasha Harlins really schooled me on this a long time ago but my problem is I kept believing people wouldn’t just lie like this.

Bat speed aging curve, but this time I account for the fact that we are less likely to observe very young/old players. The corrected curve declines less rapidly early and more rapidly later compared to the regular curve, which seems like the correct inference:

Bat speed aging curve comparing two methods, one with no correction for age and another that corrects for age (fewer younger players and older players)

New article today about work I’ve done on classifying swing types and how hitters vary their swing based on location and count. Personally, I’ve found it hard to group swings together in my head based on the new data, so this attempts to do that.

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An acceleration of an existing trend this year: First-time head coaches hiring former HCs as coordinators. I traveled around the NFL this summer to understand what that type of partnership really looks like, from honest reflection and tough lessons to truly ruthless competition:

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wow, all these Dems looking for the left's Rogan, as if a thrice-weekly, very long sports podcast that loves stats and science BUT ALSO baseball players kissing THOUGH ONLY IF THEY WANT TO isn't right there WOW

Read this nice article on Shape Constrained Additive Models yesterday. Tried it out today on some generated data, comparing a standard GAM to a SCAM with upward trend (correct) and SCAM with downward trend (incorrect). GAM and correct SCAM are similar, with the SCAM being less wiggly.

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🚨 The Packers took a first round receiver 🚨 Absolutely love them getting Matthew Golden. Playoff loss showed they needed someone who could take the top of the defense and beat man coverage. Sharp route runner with terrific hands who wins at all three levels. My favorite pick of the draft so far.

Submitted an abstract for Saber Seminar! If you have an idea and could present it in Chicago this summer, here's the form for submission: forms.gle/687GBSbyw5tB... Saber Seminar is an excellent place to have your work seen by front offices.

Saberseminar Abstract Submission Form

Thank you for considering presenting your work at Sabermetrics, Scouting, and the Science of Baseball 2025. Because of your efforts, we have grown to be a national meeting known for showcasing new, or...

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i miss the early internet. people were like “you gotta see this dude. this cat sure is long.” and they were right. it was really long. it never shoulda gotten any more complicated than that.