Bill Petti
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billpetti.bsky.social
Bill Petti
@billpetti.bsky.social
1.3K followers 450 following 8 posts
Data and Decision Science. I used to do some baseball research. ⚾️🏑🥍📈 Creator: baseballr package for #rstats (https://billpetti.github.io/).
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Reposted by Bill Petti
aaronsojourner.org
The statement from the Friends of BLS, which is co-chaired by former BLS Commissioners appointed by Obama and Trump. bsky.app/profile/aaro...
aaronsojourner.org Aaron Sojourner @aaronsojourner.org · Aug 1
"...escalates the President’s unprecedented attacks on the independence & integrity of the federal statistical system.

"The president seeks to blame someone for unwelcome economic news.

"...firing Dr. McEntarfer is without merit & undermines the credibility of federal economic statistics..."
President Trump called into question the integrity of the Employment Situation report that the BLS released this morning. He accused BLS Commissioner Erika McEntarfer of deliberately reporting false numbers to reflect poorly on this administration. This baseless, damaging claim undermines the valuable work and dedication of BLS staff who produce the reports each month. This escalates the President’s unprecedented attacks on the independence and integrity of the federal statistical system. The President seeks to blame someone for unwelcome economic news. The Commissioner does not determine what the numbers are but simply reports on what the data show. The process of obtaining the numbers is decentralized by design to avoid opportunities for interference. The BLS uses the same proven, transparent, reliable process to produce estimates every month. Every month, BLS revises the prior two months’ employment estimates to reflect slower-arriving, more-accurate information. This rationale for firing Dr. McEntarfer is without merit and undermines the credibility of federal economic statistics that are a cornerstone of intelligent economic decision-making by businesses, families, and policymakers. U.S. official statistics are the gold standard globally. When leaders of other nations have politicized economic data, it has destroyed public trust in all official statistics and in government science. We call on Congress to respond immediately, to investigate the factors that led to Commissioner McEntarfer’s removal, to strongly urge the Commissioner’s continued service, and ensure that the nonpartisan integrity of the position is retained. The statement from the President undermines these tenets and politicizes data which cannot and should not be used for political points.
August 1, 2025 at 10:01 PM
Reposted by Bill Petti
bencasselman.bsky.social
For months, people have been asking me whether I still trusted gov’t data. My answer was always the same: The stats agencies faced longstanding challenges, some of which Trump was making worse. But there was no sign of political meddling.
I can’t say that anymore.
www.nytimes.com/2025/08/01/b...
Trump, Claiming Weak Jobs Numbers Were ‘Rigged,’ Fires Labor Official
www.nytimes.com
August 2, 2025 at 12:08 AM
billpetti.bsky.social
Latest installment of Kids are Great…
February 16, 2025 at 3:00 PM
Reposted by Bill Petti
bachlaw.bsky.social
Today, we explore an overlooked area: how to model average maximum athletic effort, skills at which athletes repeatedly try their hardest, resulting in a heavily left-skewed distribution. Hitting a baseball, throwing a football deep, a first serve in tennis ... examples are everywhere. 1/3
Exit Velocity: Modeling Average Maximum Athletic Effort | Baseball Prospectus
A better way to look at average exit velocity.
www.baseballprospectus.com
December 13, 2024 at 3:41 PM
Reposted by Bill Petti
dszymborski.fangraphs.com
For those new to BlueSky and interested in FanGraphs writers -- or those who aren't, making this an odd choice -- I put together a FanGraphs starter pack of writers/editors who currently are staffers or contributors to the site.

go.bsky.app/Q1Dm1ED
November 20, 2024 at 6:39 AM
billpetti.bsky.social
When you realize @jaysonst.bsky.social reads your research (@jeffwzimmerman.bsky.social)

www.nytimes.com/athletic/598... As Juan Soto embarks on $765M future, Ted Williams’ shadow lingers: Where could he end up?
December 11, 2024 at 4:58 PM
Reposted by Bill Petti
tangotiger.com
So, Jim Albert was kind enough to share how to code the color palette in R:

baseballwithr.wordpress.com/2024/12/02/u...

cc: @billpetti.bsky.social
December 2, 2024 at 4:31 PM
billpetti.bsky.social
Proud dad moment. Congrats to our eldest on her commitment to play lacrosse and continue her studies at Mount Saint Mary’s University
November 25, 2024 at 1:32 PM
Reposted by Bill Petti
drmowinckels.io
Here is my opinion on important #rstats accounts to follow.

go.bsky.app/8pYGwbP

It is very much a curated list by me, and reflects my own opinion. I will be adding to it as I discover more folks i think should be on the list.
October 23, 2024 at 10:02 AM
billpetti.bsky.social
Tore rib cartilage following a sneeze
v.milcom.in Viv @v.milcom.in · Nov 2
Hit me with your most embarrassing injury.

Mine is spraining my side trying to remove a shirt.
November 11, 2024 at 2:05 AM
Reposted by Bill Petti
skykalkman.bsky.social
Created a Baseball Analysis Nerds starter pack.

Very much a work in progress, please send me more suggestions, including yourself. (If I'm not familiar with the account, will help if they have an obviously analytics-slanted profile or posts on Blue Sky.)

go.bsky.app/GZjLuxK
November 10, 2024 at 10:13 AM