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tj mahr 🤘

@tjmahr.com
2.7K followers 1K following 6K posts

data scientist studying how kids learn to speak, dad, jump roper, bayesian, husband to @amandawalrus.bsky.social, tjmahr.com, Madison, WI

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Reposted by tj mahr 🤘
Mike Barthel @mikebarthelauthor.com · 22h
Heard a BBC reporter pronounce “saxophonist” and I had to sit down.
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Kate Hagen 🦂 𓋹 🦂 @thathagengrrl.bsky.social · 17h
"Meanwhile, Jane Doe dropped out of Cornell and was denied her request to get her tuition refunded so that she could transfer to a different college. She hence faced more severe consequences than most of the men who she alleges gang-raped her." www.thecut.com/article/what...
thecut.com
What It Feels Like at Cornell Right Now
As a professor at the Ivy League school, Kate Manne has known many, many victims. There’s a palpable feeling on campus, she writes, that this is big.
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tj mahr 🤘 @tjmahr.com · 16h
good ol Facebook, making bayes theorem as confusing as possible
Infographic explainer of the medical testing version of bayes theorem
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Kelsey Atherton @atherton.bsky.social · 22h
Universal Daycare is a staggering boon for working parents and for kids, it is among the greatest blessings of living in New Mexico in this time, and everywhere else should be so lucky. The whole point is to make stay-at-home a choice, not obligation, so everyone can have full lives as full people.
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Theodore Grunewald @tedgrunewald.bsky.social · 29/09/2026
JCO for the win.
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tj mahr 🤘 @tjmahr.com · 22h
# usual workflow fit_model <- function(model_name, ...) { # have a list of formulas, each with an attribute for a "model type" # ... formula <- formulas[[model_name]] priors <- lookup_priors(attr(formula, "model_type")) # ... brm(..., file = model_name) }
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tj mahr 🤘 @tjmahr.com · 29/09/2026
some early cartridges of Super Mario Bros 3 are “Left Bros” cartridges because they put the word “Bros” in a goofy ass position on the left and later productions moved it to the more sensible position on the right. The more you know 💫
Left BrosRight Bros
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tj mahr 🤘 @tjmahr.com · 29/09/2026
I just want to share that the Hyvee offbrand version is called “panburger partner”
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tj mahr 🤘 @tjmahr.com · 29/09/2026
I have three instances where my role qua statistician involved being the human who had to review and vouch for the analysis technique and code provided by ChatGPT/Claude
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tj mahr 🤘 @tjmahr.com · 07/12/2025
Our blessed caribou. Their barbarous reindeer.
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tj mahr 🤘 @tjmahr.com · 28/09/2026
Leg day
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Dan Diamond @ddiamond.bsky.social · 28/09/2026
Russell Brand, who's awaiting trial in London next month on rape and sexual assault charges, will moderate a panel at DC's MAHA summit tomorrow on reforming a U.S. health agency
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tj mahr 🤘 @tjmahr.com · 28/09/2026
why dont you just use emmeans to compute a contrast? because i don’t know what it’s doing and can do the computation myself
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tj mahr 🤘 @tjmahr.com · 28/09/2026
probability value or “peeve” for short
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tj mahr 🤘 @tjmahr.com · 25/09/2026
factor()s are underrated bc they give you custom sorting ("low", "mid", "high") and custom labels. but they are also fragile. you write them out to csv and lose all that.
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tj mahr 🤘 @tjmahr.com · 25/09/2026
look at this beast
screenshot of page thumbnails for supplement materials document
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tj mahr 🤘 @tjmahr.com · 25/09/2026
I am inserting page orientation directives into a markdown document that are intercepted by pandoc / a lua filter, so why not just use one of those latex or typst at this point
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tj mahr 🤘 @tjmahr.com · 25/09/2026
what a handy page easystats.github.io/effectsize/r...
easystats.github.io
Interpret Correlation Coefficient — interpret_r
Interpret Correlation Coefficient
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tj mahr 🤘 @tjmahr.com · 25/09/2026
new gilla band album lfg
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ex-Lethality Jane @lethalityjane.bsky.social · 25/09/2026
Literally everyone will tell you that.
Threads post 

Early Beatlemania was fuelled by teenage girls, but they won't tell you that.

Women and girls have always been the trendsetters and the tastemakers.
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tj mahr 🤘 @tjmahr.com · 25/09/2026
learning new words from my kindergartener’s penguin book en.wiktionary.org/wiki/cr%C3%A...
en.wiktionary.org
crèche - Wiktionary, the free dictionary
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anil oza @aniloza.bsky.social · 24/09/2026
Confirming the White House’s planned EO to exert more political control on NIH seems to be “dead” www.statnews.com/2026/09/23/n...
statnews.com
White House plan to increase control of NIH grants appears 'dead'
A planned EO that would have greatly enhanced White House influence over grants at the NIH is “looking dead,” a source said.
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Deon T. Benton @deontbenton.bsky.social · 24/09/2026
Anyone have access to the following reference? I've struck out. Hunter, M. A., & Ames, E. W. (1988). A multifactor model of infant preferences for novel and familiar stimuli. Advances in Infancy Research, 5, 69–95.
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ceej @ceej.online · 29/11/2025
I regret every joke I’ve made about how our elected officials were so old they didn’t know how to use a computer. I would give anything for another administration that doesn’t know how to use a computer
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tj mahr 🤘 @tjmahr.com · 23/09/2026
lil brms rmarkdown tip v <- list() # brms gives you these v$brms <- model$version$brms v$cmdstanr <- model$version$cmdstanr v$stan <- model$version$stan v$rstan <- model$version$rstan # close enough v$r <- getRversion() # but i should be stashing the R version inside the model object

## Software details

Analyses were conducted in the R programming language [vers. `r v$r`,
@r-base]. Models were fit using the Stan programming language
[vers. `r v$stan`, @stan-base] via the brms
[vers. `r v$brms`, @brms2017] and cmdstanr [vers. `r v$cmdstanr`,
@r-cmdstanr] R packages. Handling the posterior samples
was greatly simplified by the posterior [vers. `r v$posterior`,
@r-posterior] and ggdist [vers. `r v$ggdist`, @ggdist2024] R packages.
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eminemerald fennell @fireh9lly.bsky.social · 22/09/2026
I think it's really interesting how the Fleetwood Mac revival has led to this weird retconning of the complaint about their music being that it was too hip and obscure instead of too smooth, polished, safe and adult oriented
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On My Own Journey. @plsdontreplytome.bsky.social · 23/09/2026
i googled a lyric from a jesus lizard song trying to remember what album its on and it hurt google ais feelings and it turned itself off lol
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Mike Barthel @mikebarthelauthor.com · 23/09/2026
Daft Punk were not only so successful at changing music that future listeners find their innovative work to be generic sounding, but that they themselves made a deliberately un-innovative (and boring) album themselves.
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Darren Dahly @statsepi.bsky.social · 23/09/2026
I enjoyed this. Was gonna rant, but even I'm sick of hearing it. www.nature.com/articles/s41...
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Rosalynde @roslaynde.bsky.social · 17/09/2026
every will stancil tirade is exactly the same: selective framing of an argument that he uses to moan about how his rivals are cooked by social media and peer pressure, and that he, a terminally online guy with 100k followers, is immune to these pressures and is never wrong (& is the real victim)
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Matthew Perpetua @fluxblog.bsky.social · 23/09/2026
New playlist THE BEST OF ADULT CONTEMPORARY 1987-1992 Sincere, mature, and dramatic songs about love A nearly extinct style of music, people are too cynical now 💝 Spotify: open.spotify.com/playlist/5S5... ❤️ Apple: music.apple.com/us/playlist/... ❤️‍🩹 YouTube: www.youtube.com/playlist?lis...
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Mark Histed @markhisted.org · 23/09/2026
Can confirm (see 🧵 ). But let me share some optimism. A NIH colleague said today that against all odds, NIH has been…winning. “We made this EO a necessity. We fought hard. We threw sand in all the gears. All the lowdown ways of blocking grants failed to produce the results Vought et al wanted.”
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Jenna Norton @jenna-m-norton.bsky.social · 23/09/2026
What. A. Day. NIH grant-making was paused for several hours today. Not sure who gave the order. But in light of the Friday night Bhattacharya-Vought feud & threatened EO to implement #ScienceDeathPanels, my money is on Russell Vought. I learned of the pause from a colleague around 11:30. 🧵
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tj mahr 🤘 @tjmahr.com · 22/09/2026
bass here is really making me think of Nirvana open.spotify.com/track/1508dF...
open.spotify.com
Potential Suicide
Wipers · Is This Real? · Song · 1980
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tj mahr 🤘 @tjmahr.com · 22/09/2026
open.spotify.com/track/4kxDKj...
open.spotify.com
Colour Me In
Broadcast · Haha Sound · Song · 2003
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Gavin Simpson @gsimpson.bsky.social · 22/09/2026
@digitalocean.com is now dead to me. There is almost nothing they could do to redeem themselves after supporting that racist arse hole DHH Do not support this company at all www.digitalocean.com/blog/digital...
digitalocean.com
Built for agents: Omarchy's pipeline moves to DigitalOcean | DigitalOcean
DigitalOcean is joining the Omacom Foundation, the nonprofit that funds Omarchy's infrastructure and the open source projects it depends on, as a Founding Corporate Patron, and will serve as Omarchy's...
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Robin Blythe @rbly.bsky.social · 22/09/2026
It is SO EASY to specify mo() for an ordinal variable in brms that I don't think I can go back to treating them as continuous or dummy vars. Even splines are super easy. Next on my wishlist is that mi() integrates cleanly with mo() and s() 😍 #rstats
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tj mahr 🤘 @tjmahr.com · 22/09/2026
#rstats note on a print(dataframe) -> data.frame() workaround i did www.tjmahr.com/notes/2026-0...
tjmahr.com
Quick hack to parse brms priors print-out
At the time of writing, the print() function for a brms prior specification does some row-filling to make things more verbose and explicit. But these details are not available as a dataframe for the ...
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tj mahr 🤘 @tjmahr.com · 22/09/2026
the only good thing about stephens’ opinion column is that you get to use the word “sinecure” to talk about it
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Frovo @frovo.bsky.social · 18/01/2025
ME: wanna hear a joke BSKY REPLY PERSON: a what
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Colin @colin-fraser.net · 21/09/2026
I stand by this
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Katherine Alejandra Cross @quinnae.com · 22/09/2026
As my colleague ably points out: if Paxton wins, centrist transphobes will simply say that Dems will have to turn up the bigotry dial. If Talarico wins *we* can emphasize Paxton's scorched earth anti-trans campaign and say, with justice, that transphobia is a vote loser.
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tj mahr 🤘 @tjmahr.com · 21/09/2026
*tears in my eyes*
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Stella Sacco @antlervel.vet · 19/09/2026
I hate when I’m hit with a weapon or elemental damage type that corresponds to my weakness
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Colin @colin-fraser.net · 21/09/2026
Alright. Let me resolve this once and for all. The simple fact is that there are a few different things that can be reasonably meant by “thinking” and mixing them up is what’s making everyone mad.
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tj mahr 🤘 @tjmahr.com · 21/09/2026
when they finally explain the eval and apply metacircular evaluator, the instructor puts on a fez and a cape and "also spake zarathustra" plays youtu.be/aAlR3cezPJg?... at 34:39
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tj mahr 🤘 @tjmahr.com · 21/09/2026
I get depressed when I review something and it seems AI-assisted (as in well written but shallow and making weird jumps in spots). Why am I wasting my time putting in thought that wasn’t given in the first place
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Jon Harmon (he/him/his) @jonthegeek.com · 21/09/2026
I've been feeling pretty down. When I found #RStats, I kinda fell in love, and decided to become as much of an expeRt as I could be. In the age of AI, that's not a good idea; why make the bots program in a language they don't really understand? #dataBS
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Jordan Collver @jordancollver.bsky.social · 21/09/2026
static.klipy.com
Theyll Soon Be Back Greater Numbers
Alt: Obi-Wan saying "They'll Soon Be Back, and in Greater Numbers"
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zakalwe2024.bsky.social @zakalwe2024.bsky.social · 20/09/2026
Men in their 40s/50s whinging about how “they ruined Star Wars” is definitely one of the more depressing traits of my generation.
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