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Malcolm 朝精 Barrett

@malcolmbarrett.malco.io
5.3K followers 834 following 773 posts

Ph.D., epidemiology. research software engineer @ Stanford Health Policy. living in Ann Arbor. open-source data science. causal inference. doing poems on aircrafts. approximately Bayesian. formerly Posit, Apple, AmeriCorps. 心を燃やせ。sic semper tyrannis.

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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 5h
The pro data center elephant and piggie was pretty weird
An elephant and piggie book called “I really like slop”
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 10/09/2026
Listening to this Mingus classic on the importance of version control
Album artwork for Charles Mingus’s Mingus Ah Um, featuring an abstract geometric painting in muted red, blue, yellow, pink, and cream. Below the cover, the track “Better Git It in Your Soul” and artist Charles Mingus are displayed.
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 06/07/2026
further evidence that being healthy means that you are healthy
An NPR headline: Fast walkers in their 80s cut their risk of cognitive decline by half, a study finds
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 07/06/2026
頑張った
a screenshot: Crabigator Apprentice Info
malcolmbarrett
Level 60
Apprentice
Serving the Crabigator since June 11, 2021
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 03/06/2026
the charlie day conspiracy meme
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 08/04/2026
point of discussion: have we considered perhaps that the markets are stupid
A news headline: "Oil prices plunge and stocks soar after U.S. and Iran agree on a ceasefire"
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 09/12/2025
Luckily, I’ve had a fever for two days. My brain is cooked, but I make a great heater
A brown tabby snuggling in bed with a sick human
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 09/12/2025
Winter is an affront to all cats
A brown tabby sitting in front of a heater vent
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 18/11/2025
You’re a timerfluencer, Libby
A deal with a chess timer on a monitor stand
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 02/11/2025
Oh shit I think the spam texters are pissed at me
Can I have a quick word?
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 18/10/2025
Kids in the street
A child with an emoji mouse face and a protest sign that says “no kings”
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 18/10/2025
A protest sign that says “sic semper tyrannis”
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 29/09/2025
There are three kinds of lies: lies, damned lies, and
a checkbox on a website that says "keep me logged in"
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 15/08/2025
Casual AI is the future
LinkedIn screen shot that says “GPT-5 is able to predict the outcome of experiments that we haven't even done. That saves us weeks and even months."

Immunologist and professor Dr. Derya Unutmaz explains how he uses GPT-5 as a collaborator on medical research. It’s our most intelligent model yet, capable of generating novel hypotheses, accelerating discoveries, and pushing the frontier of science.”
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 08/08/2025
GPT-5 is like having a “team of Ph.D. level experts in your pocket.” The Ph.D. level experts:
Marty Makary, RFK, and Jay Bhattacharya during a terrible press briefing
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 15/07/2025
And also
A meme of kronk with a devil on his shoulder saying "vectorize it" and an angel saying "you'll spend more time rewriting your code than you save in computation time"
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 15/07/2025
kronk with a devil and angel on his shoulder. The angel says "vectorize it" and the devil says "you'll spend more time rewriting your code than you save in computation time"
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 17/06/2025
New target population just dropped
A screen shot of a news article headlined “scientists have discovered third state between life and death”
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 02/05/2025
Zuck: The average American has three friends
A movie poster of the movie Clueless with three woman
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 01/03/2025
That’s not what’s happening. We’re not talking about intellectually nuanced conversations with people of differing views. We’re talking about a Nazi platform full of fucking nazis. This is not hyperbole. Elon is a Nazi.
Elon Musk, a Nazi, making a Nazi salute
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 28/11/2024
It’s Thanksgiving in Detroit. Go Loins!!!
A wooden decoration of the Detroit Lions logo with the words “Detroit Loins” on it
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 28/11/2024
A very whimsical Thanksgiving to you from Grinnin’ Barrett’s Bakery
Three loaves of homemade sourdough bread in a whisker basket
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 26/11/2024
Scooby do unmasking meme: the first panel says “research question”, the second panel, unmasked, says “whatever coefficient logistic regression gives me”
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 26/11/2024
WHAT’S YOUR ESTIMAND
A dog in a conference room surround by people with a tv of virtual attendees. The dog is barking and looks like he’s yelling at someone across the table
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 21/11/2024
Got an email about a bitchin’ new ATT estimator #causalsky #eleventoqueestabaesparando
A screenshot from an email with a clip art car that is labeled “ATT”. The caption says ¡llega el evento que estabas esperando!
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 15/11/2024
#causalsky hell of a new new instrumental variable identified
A sign outside a liquor store that says “super liquor IV” with pictures of whiskey
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 30/10/2024
Learning about all the cool new diff-in-diff estimators from #econsky the past few years, but just thinking about one thing the whole time #causalsky #causalinference
A photo of a Yankees fan interfering with the World Series game. He is labeled "parallel trends assumption". A baseball player has a ball in his glove. He is labeled "ATT". The fan is trying to take the ball from the glove.
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 22/10/2024
A meme of Bruce Banner saying "That's my secret, Cap. I'm always partially identifying"
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 04/10/2024
All numbers are nerds but not all nerds are numbers.
A screenshot of Fox News on twitter. It says Jason Kelce blasts statistics in a wild rant: stats are numbers, numbers are nerds, nerds are losers
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 15/08/2024
Oh good I found a likely real causal effect here. Scam people into improving their grips -> make money
An article headline with a picture of someone hanging from a bar with both hands. It says:

If You Can Hang From a Bar For This Long, Scientists Say You're Likely to Live a Longer, Healthier Life And what simple tests like this one can mean for entrepreneurs hoping to serve on of the biggest addressable markets on the planet
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 04/04/2024
We are excited to be hosting Causal Inference in R Workshop at the 10th annual New York R Conference on May 15! Join us in NYC or virtually online! Get 20% off your ticket now with promo code NYR10 at rstats.ai/nyr #rstatsnyc | #rstats
A card about the workshop on May 15
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 01/12/2023
If you’re familiar with structural equation models (SEMs), a modeling technique commonly used in psychology and other social science settings, you may notice some similarities between SEMs and DAGs. DAGs are a form of non-parametric SEM. SEMs estimate entire graphs using parametric assumptions. Causal DAGs, on the other hand, don’t estimate anything; an arrow going from one variable to another says nothing about the strength or functional form of that relationship, only that we think it exists.
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 29/11/2023
We've made a major update to the causal diagrams chapter of Causal Inference in R! Check it out to learn about DAGs! I think there's a lot in this chapter that is undercovered in other sources. #rstats #causalinference @lucystats.bsky.social @travisgerke.bsky.social www.r-causal.org/chapters/05-...
A screenshot of Causal Inference in R: Causal DiagramsA screenshot of a DAG from Causal Inference in R showing two open pathways in an analysis a scientist must account for to get the correct answerA screenshot of a DAG from Causal Inference in R showing how to describe feedback loops in causal diagrams
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 15/09/2023
We just overhauled the first chapter of our book, Causal Inference in R! Learn about causal questions, their structure, and the relationship between description, prediction, and causal inference. www.r-causal.org/chapters/cha... @lucystats.bsky.social @travisgerke.bsky.social #rstats
A screenshot of the first chapter of Causal Inference in R: What is a causal question?A sentence diagram of a causal question showing it's essential components: exposure, outcome, eligibility criteria, time-zero, target population, and follow-up periodA visualisation of a descriptive question: what were the number of deaths in 2020 vs the expected deaths based on historical data (by country)? The figure shows the shocking toll of the early pandemic, with actual 2020 deaths far above expected deaths. This is a useful graph for understanding risk without making causal claims
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Malcolm 朝精 Barrett @malcolmbarrett.malco.io · 06/09/2023
I was thinking about trebuchets and remembered this
Tweet from @malco_barrett: "Methods: We took covariates, such as age and sex, put them into a trebuchet, lit them on fire, and hurled them into our model from a distance of 200m."
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