Jonathan N. Katz
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jnkatz.bsky.social
Jonathan N. Katz
@jnkatz.bsky.social
1.8K followers 1.7K following 7 posts
Professor at Caltech. Social Sciences and Statistics.
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Reposted by Jonathan N. Katz
caltechlcssp.bsky.social
Register here:
caltech.zoom.us/webinar/regi...

#ElectionScienceOfficeHours
@jnkatz.bsky.social @rmichaelalvarez.bsky.social @caltech.edu @caltechlcssp.bsky.social
#CaltechElectionIntegrity
Welcome! You are invited to join a webinar: A Conversation with Caltech's Jonathan N. Katz: State Redistricting Impacts Around the Nation. After registering, you will receive a confirmation email abou...
Please join us on Tuesday, October 28, 2025 at 1:00pm Pacific for the next episode of Election Science Office Hours, a webinar series presented by the Caltech Election Integrity Project and moderated ...
caltech.zoom.us
October 23, 2025 at 3:52 PM
Reposted by Jonathan N. Katz
librarian.bsky.social
Every Californian with an email address and an internet connection can now visit California’s Bookshelf and access more than 300,000 ebooks and audiobooks.

www.library.ca.gov/uploads/2025...
Two women standing on top of a gnarled ancient pine tree on Sentinel Dome with a mountain range viewable in the background
March 29, 2025 at 6:00 PM
Reposted by Jonathan N. Katz
florianederer.bsky.social
Innovation is afoot in the ski industry.

BOA boots are changing skiing ... and ski racing.
www.skimag.com/gear/boa-ski...
BOA Boots Are Changing Skiing—So Why Won’t Racers Wear Them?
Skiers swear by BOA technology, yet the world’s best racers refuse to make the switch. Do they know something we don’t?
www.skimag.com
March 22, 2025 at 3:50 AM
Reposted by Jonathan N. Katz
vinpons.bsky.social
We are very happy to publish the "National Elections Database," including the results of 1,023 presidential and 2,962 parliamentary elections conducted worldwide since 1946!
www.nationalelectionsdatabase.com
with Benjamin Marx and Vincent Rollet
Overview
National Elections Database
www.nationalelectionsdatabase.com
March 13, 2025 at 12:20 PM
Reposted by Jonathan N. Katz
gelliottmorris.com
538-style poll collection has now been recreated by a small group of fans and former staff. all fully transparent and public now. return of live public aggregation is imminent

docs.google.com/spreadsheets...
Polls
docs.google.com
March 7, 2025 at 6:52 PM
Reposted by Jonathan N. Katz
skiles.blue
I got laid off today, with the rest of 18F.

18F was an elite federal software shop. We made gov't websites work better, more efficiently for the American people. We saved taxpayers from getting screwed over by contractors. And were fired for it.

We made this website to tell our story:
18f.org
We're not done yet | 18F
18f.org
March 1, 2025 at 10:38 PM
Reposted by Jonathan N. Katz
icpsr.bsky.social
#UMISR: Preserve At-Risk Government Data!

DataLumos, an open-access archive at ICPSR, is working to preserve/share critical govt data. Help keep the data accessible.

Donate: datalumos.org
Explore & contribute: myumi.ch/egrbW
Volunteer: icpsr-data-rescue@umich.edu

#DataPreservation #SocialScience
Graphic promoting data protection efforts. The background features a pattern of yellow, blue, and white triangles. A large navy blue circular overlay at the center contains the message in bold yellow text: "HELP US PROTECT AT-RISK DATA" Below, in smaller white text: "Your contribution TODAY shapes TOMORROW" The University of Michigan ISR logo appears at the top of the circular overlay.
February 21, 2025 at 9:12 PM
Reposted by Jonathan N. Katz
vincentab.bsky.social
Rdatasets is a collection of 2300 free and documented datasets in CSV format. It's a great resource for teaching and exploration!

The new `get_dataset()` function from the {marginaleffects} 📦 allows you to search and load them directly in #Rstats.

vincentarelbundock.github.io/Rdatasets/ar...
February 14, 2025 at 12:54 PM
Reposted by Jonathan N. Katz
profstevensmith.bsky.social
Looking for free, short readings on elements of congressional politics for your course? Check this out. stevesnotes.substack.com
Steve's Notes on Congressional Politics | Steven S. Smith | Substack
Insightful briefs on the politics of the the U.S. Congress. Click to read Steve's Notes on Congressional Politics, by Steven S. Smith, a Substack publication with hundreds of subscribers.
stevesnotes.substack.com
December 30, 2024 at 9:00 PM
Reposted by Jonathan N. Katz
noahgreifer.bsky.social
If you have an issue where Dropbox is constantly syncing while @posit.co #RStudio is open, one solution is to run the following code in Terminal:

find "Dropbox" -type d -name ".Rproj.user" -print0 | while IFS= read -r -d $'\0' folder; do xattr -w com.dropbox.ignored 1 "$folder"; done

#rstats
December 14, 2024 at 10:14 PM
Reposted by Jonathan N. Katz
rmichaelalvarez.bsky.social
Last week, Jacob Morrier and I presented about work that dramatically speeds up probabilistic record linkage using GPU acceleration. Documentation and code for Fast-ER is available, fast-er.readthedocs.io/en/latest/

But better yet, watch the video!
youtu.be/wsv__0a_KDY?...
Fast ER GPU Accelerated Record Linkage in Python by Dr R Michael Alvarez and Jacob Morrier CalTech
YouTube video by Data Analytics Colloquium
youtu.be
December 11, 2024 at 12:13 AM
Reposted by Jonathan N. Katz
davidkarol.bsky.social
Voters are mostly partisans who rationalize, swing voters are often ignorant and voters project their views onto their candidates. But this has always been true! The media was better once, but there was no golden age. Most of their grandparents did not read Walter Lippmann's column.
jamellebouie.net jamelle @jamellebouie.net · Dec 10
we're cooked
December 10, 2024 at 3:53 PM
Reposted by Jonathan N. Katz
rmcelreath.bsky.social
Very nice example of how useful comparison (or trend calculation) usually needs something more than coefficients. They have a nice page on the general idea that is hidden down in the thread: ourworldindata.org/age-standard...
scientificdiscovery.dev Saloni @scientificdiscovery.dev · Dec 9
Americans are now one-third less likely to die from cancer at the same ages as Americans in 1990
How has the risk of dying from cancer changed in the United States? To understand this, we can look at national cancer death rates in the United States. The gray line shows the crude rate, which is the rate of deaths from cancer per 100,000 people. It has risen between 1950 and 1990 and has fallen slightly since then. However, cancer death rates rise sharply with age, and the age of the US population has increased since 1950, so we would expect cancer death rates to rise for that reason alone. What if we adjust for the increased age of the US population? The red line, the age-standardized rate, shows this. It shows the cancer death rate if the age structure of the US population was held constant throughout. This shows a slight rise until 1990 and then a significant decline; rates have fallen by one-third. This means Americans are now one-third less likely to die from cancer at the same ages as Americans in 1990. This comes from several factors: better screening and earlier diagnosis, medical advances in cancer treatments, and public health efforts to reduce risk factors like smoking and exposure to carcinogens.
December 9, 2024 at 11:12 AM
Reposted by Jonathan N. Katz
jessicahullman.bsky.social
I'm teaching a grad seminar this winter on Prediction for Decision-making. We'll look at what it means to make good predictions for decision-making from various angles, with a focus on decisions for & about people.

Reading list: statmodeling.stat.columbia.edu/2024/12/06/n...

Suggestions welcome!
New Course: Prediction for (Individualized) Decision-making | Statistical Modeling, Causal Inference, and Social Science
statmodeling.stat.columbia.edu
December 6, 2024 at 4:45 PM
Reposted by Jonathan N. Katz
vincentab.bsky.social
Our JSS article is out!

And now I get to focus on {marginaleffects} 1.0.0. Stay tuned.

www.jstatsoft.org/article/view...
December 1, 2024 at 11:00 PM
Reposted by Jonathan N. Katz
matthewgnagler.bsky.social
This is good advice. People with stable handles, bios, and a post or two present well to would-be followers. Consider also a photo or thoughtful logo of yourself.
magnusrasmussen.bsky.social Magnus B Rasmussen @magnusrasmussen.bsky.social · Nov 30
Please fix your handle and bio before you start following people.

Makes it a lot easier to know whether people should follow you or not.
November 30, 2024 at 1:09 PM
Reposted by Jonathan N. Katz
hadley.nz
If you're interested in trying out LLMs in #rstats but don't know where to begin, I've added a few two vignettes to elmer: elmer.tidyverse.org/articles/elm... and elmer.tidyverse.org/articles/pro...
Getting started with elmer
elmer.tidyverse.org
November 29, 2024 at 3:45 PM
Reposted by Jonathan N. Katz
vincentab.bsky.social
New notebook:

Sample Size Calculations in #RStats : Money and Power

arelbundock.com/posts/money_...
November 29, 2024 at 5:08 PM
Reposted by Jonathan N. Katz
carlislerainey.bsky.social
Boosting Anton's starter pack to #StatsSky and #polisky. Lots of people worth following here.

bsky.app/starter-pac...
Political Methodology
Join the conversation
bsky.app
November 26, 2024 at 5:27 PM
Reposted by Jonathan N. Katz
cfcamerer.bsky.social
Great to see @aleximas.bsky.social and gang of coauthors measuring salience *independently of choice* with an early well-trained algorithm (from @caltech.edu btw) that predicts visual attention for any image (a la Li and me QJE academic.oup.com/qje/article-...)
November 27, 2024 at 7:19 PM
Reposted by Jonathan N. Katz
anthlittle.bsky.social
After a review process so long and intensive that the title changed twice, I'm excited/relieved that "How to Distinguish Motivated Reasoning from Bayesian Updating" is accepted at @polbehavior.bsky.social.

osf.io/preprints/os...

Here is how it's relevant for your Thanksgiving dinner 🦃👇
OSF
osf.io
November 27, 2024 at 4:18 PM