Sign in

Martin Modrák

@modrakm.bsky.social
1.4K followers 47 following 288 posts

Biostatistics/bioinformatics at Charles University, 2nd faculty of Medicine. Bayesian in practice, but not a fan of Bayesian epistemology. Main on fedi: bayes.club/@modrak_m Blog: martinmodrak.cz

PostsRepliesMedia
Reposted by Martin Modrák
Grass Toucher Georg @avengingfem.me · 07/10/2026
i have a new theory of Social Media Bad. a lot of ink has been spilled about the addictive qualities of twitterlike social media, including many allegations of developer use of "dark patterns" and self conscious "engagement maximizing", but i'd like to propose something a little more mundane.
613828
Reposted by Martin Modrák
Grass Toucher Georg @avengingfem.me · 07/10/2026
because, as long as you actually care about having the conversation, which i do, *the rational response* is to start multitasking. do part of a chore, until you get a notification, or you check the app. write another reply, and then back to the chore. all day long. because that's how long it takes.
1754
Martin Modrák @modrakm.bsky.social · 20h
Broadly agree, though metrics evaluating pairs of studies (esp. "replication estimate within original prediction interval" - which they use) can be made reliable (i.e. control error rates).
100
Martin Modrák @modrakm.bsky.social · 04/10/2026
Loved the pod as usual! Wouldn't a big barrier for siRNA be that some (many? most?) rare diseases are caused not by bad protein product but by absence of the correct protein product, which siRNA cannot fix? I was curious that you didn't discuss this at all - am I missing something?
110
Reposted by Martin Modrák
Saloni @scientificdiscovery.dev · 02/10/2026
Can we switch off diseases? siRNA drugs are, in my view and @jacobtref.bsky.social’s too, one of the most exciting developments in medicine. So we decided to do an episode!
open.spotify.com
Can we switch off diseases?
Hard Drugs · Episode
13914
Reposted by Martin Modrák
Ian Coldwater 🧊🚫 @lookitup.baby · 30/09/2026
BREAKING NEWS: “Do geese see God” is a palindrome
14780781990
Reposted by Martin Modrák
Sanho Tree @sanho.bsky.social · 26/09/2026
Happy Stanislav Petrov day! He saved the world from nuclear annihilation on this day in 1983. My freshman year in college would have been so much worse without his courage.🧵
5599185
Reposted by Martin Modrák
Os Keyes @okeyes.bsky.social · 15/09/2026
Since we’re doing another round of “AI will destroy humanity” doom-hype, it’s a good time to announce a new paper myself and my postdoc advisor just had accepted by BioSocieties on just this. TL;DR: almost all the “AI can make bioweapons” literature comes ultimately from the Effective Altruists.
ironholds.org
17752271
Reposted by Martin Modrák
Robert Komaniecki @komaniecki.bsky.social · 27/09/2026
“Why shouldn’t I custom-generate all of my child’s media?” Because the point of children’s literature, music, art, and movies is not to optimize leisure time, it is to provide your children with cultural, emotional, societal, and epistemic touch points via which they can relate to the wider world.
617643
Reposted by Martin Modrák
Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 25/09/2026
Thoughts and prayers for research data managers everywhere. You are not alone. We will get through this together techcommunity.microsoft.com/blog/excelbl...
techcommunity.microsoft.com
Excel now supports multiple values in a single cell | Microsoft Community Hub
Lists, arrays in cells, and nested arrays introduce new ways to store and organize related information, helping you keep data together without sacrificing...
2842185
Martin Modrák @modrakm.bsky.social · 25/09/2026
It's the one where they then start using humans as missile guidance computers because it's cheaper or is that another one? Oh, it's been long since my Asimov phase...
030
Martin Modrák @modrakm.bsky.social · 24/09/2026
I want this to be true, and it is an important question overall, but I admit the discontinuity plots are IMHO quite underwhelming and to me appear quite consistent with no discontinuity...
021
Reposted by Martin Modrák
Stand Up for Science! @standupforscience.net · 18/09/2026
Your life saving clinical trail could be TERMINATED by the Trump administration. We scraped through the data and found that 50% of all clinical trials are at risk of being cancelled. It's time to talk about it and what you can do to stop this. 🧵 🧪
217697
Reposted by Martin Modrák
Catalina I. Fernández, PhD (she/her) @catferna.bsky.social · 22/09/2026
New in the saga of our causal model of human growth 🚼🧬📈at AJBA: can we reconstruct growth trajectories when kids’ ages are uncertain & all we have is cross-sectional data? Turns out, YES! 🎉 Accurate estimates, with exciting (?!) implications for bioarchaeology and beyond. doi.org/10.1002/ajpa.70358
doi.org
2104
Martin Modrák @modrakm.bsky.social · 22/09/2026
Maybe this (if 2015 counts as recent): sciencebasedmedicine.org/placebo-are-...
sciencebasedmedicine.org
Placebo, Are You There?
By Jean Brissonnet, translation by Harriet HallNote: This was originally published as "Placebo, es-tu là?" in Science et pseudo-sciences 294, p. 38-48. January 2011. It came to my attention in th
010
Reposted by Martin Modrák
Alex Holcombe @alexh.bsky.social · 21/09/2026
Consequences of the flood of AI manuscripts: "An early-career researcher at an unbranded institution loses the one mechanism that ever let them be read on merit — anonymous review of the work itself, however badly it functioned in practice.
410823
Reposted by Martin Modrák
Gabriele Pollara @gpollara.bsky.social · 21/09/2026
More diagnostic tests don't always = better or reduced antibiotic prescribing. Well, not CRP in primary care anyway! #IDSky #ClinMicro @jac-amr.bsky.social academic.oup.com/jacamr/artic...
academic.oup.com
Is C-reactive protein the answer to antibiotics over-prescribing in primary care? A behavioural experiment in two European countries
AbstractBackground. Antibiotic overprescribing fuels antimicrobial resistance. C-reactive protein (CRP) is widely promoted as a point-of-care test for targ
3125
Reposted by Martin Modrák
Jiggety Jatters. The worst name. @jessefuchs.bsky.social · 21/09/2026
www.ling.upenn.edu/~beatrice/11...
ling.upenn.edu
Uncleftish beholding
2121
Reposted by Martin Modrák
Per Engzell @pengzell.bsky.social · 21/09/2026
Need new examples for teaching confounding and reverse causality to my undergrads. Send any published statistical crimes my way please.
7238
Martin Modrák @modrakm.bsky.social · 20/09/2026
I don't think that's true. Non-randomized causal inference should still work. My answer was to the narrow question: it is AFAIK possible to see regression to the mean in some/all groups. This does not mean it is impossible to run an analysis that is not misled by it.
020
Reposted by Martin Modrák
Ben Recht @beenwrekt.bsky.social · 18/09/2026
@dsquareddigest.bsky.social "13 Theses on AI and regulation" are exceptionally good. My favorite set of thoughts I've read on this topic so far.
backofmind.substack.com
13 theses on agentic AI and regulation
thinking out loud and showing traces of reasoning
1234
Martin Modrák @modrakm.bsky.social · 18/09/2026
I'd guess that if you have non-trivial selection at baseline (or other time point) you'd see regression to the mean.
130
Reposted by Martin Modrák
Noah Betz-Richman @nbetz.bsky.social · 18/09/2026
Picture of an X exchange.

First post: picture of 17 cubes of tofu fit into a ziplock bag using the optimal packing of 17 squares. 
Caption: “Wife told me these wouldn’t fit. Little did she know I had trained for this moment for years.”

Second post: “There’s no way someone actually found a practical use for the ideal packing of 17 cubes”
0183
Reposted by Martin Modrák
Mike Murphy @mjamurphy.bsky.social · 18/09/2026
I would take the alignment stuff more seriously if anyone in the space appeared remotely interested in the cases of AI being used to kill people *which have already happened*
042
Reposted by Martin Modrák
Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 18/09/2026
Happy to see others emphasizing traceability (Nachvollziehbarkeit) over simple reproducibility. Let’s make fetch happen!
15511
Reposted by Martin Modrák
Gautam Kamath @gautamkamath.com · 16/09/2026
Nihar Shah did a heroic experiment for TMLR: he spent 20-25 hours over two weeks interviewing authors of seemingly low-quality submissions about their own papers. He confirmed what we all suspected: people submitting these papers have *no idea* what is going on in them.
5293117
Reposted by Martin Modrák
Peter Ellis @freerangestats.info · 16/09/2026
Inspired by a @f2harrell.bsky.social comment, I did some #rstats simulations about how big a sample needs to be for the central limit theorem to kick in and the sample mean be normally distributed for inference purposes. Yes, with skewed data the answer is "lots". freerangestats.info/blog/2026/09...
Scatter plot with 8 facets, each showing a different distribution, and the actual coverage of a 95% confidence interval for the mean at different sample sizes. Most values are well below 95%.
33315
Reposted by Martin Modrák
Greg Wester @gwestr.me · 16/09/2026
LOL
3490146
Reposted by Martin Modrák
F.D. Shook III @fds.wsocial.eu · 16/09/2026
5,000-year-old drainage system found at #LimanTepe #Archaeology #Europe #History #Science #Turkey
hurriyetdailynews.com
5,000-year-old drainage system found at Liman Tepe
Archaeologists conducting joint land and underwater excavations at Liman Tepe, an archaeological site in the western province of İzmir’s Urla district, have uncovered a nearly 5,000-year-old drainage ...
062
Reposted by Martin Modrák
Joe Bak-Coleman @jbakcoleman.bsky.social · 16/09/2026
I replied to @zachlowenba.bsky.social (whose work I love) but feel like it probably deserves a longer thread a QT. Setting aside the AI bit, I don't think the question(s) are coherent, but they sure are harmful. 🧵
1147
Reposted by Martin Modrák
Danielle Navarro @djnavarro.net · 15/09/2026
In her ongoing quest to convince #rstats users to stop invoking the cursed "rm(list=ls())" incantation at the top of their analysis scripts, she has released sessioncheck 0.2 on CRAN. Mostly unchanged, some bug fixes, some new reporting features that are most useful in the regulatory context
blog.djnavarro.net
Release: sessioncheck 0.2 – Notes from a data witch
In which the author realises she doesn’t know how to write package release posts
4439
Martin Modrák @modrakm.bsky.social · 14/09/2026
I will be looking for a PhD student in Bayesian statistics (in collaboration with Paul Bürkner), located in Prague. Forward to students if you have somebody who could be interested. www.martinmodrak.cz/grammo-call/
martinmodrak.cz
Grammo - Let's Research Bayes!
03324
Reposted by Martin Modrák
Julia M. Rohrer @dingdingpeng.the100.ci · 14/09/2026
Okay before I do write my screed about cluster analysis, please send me your favorite *positive* examples that illustrate the utility of the method!
304011
Martin Modrák @modrakm.bsky.social · 13/09/2026
The road to IKEA is paved with good intentions.
021
Reposted by Martin Modrák
Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 12/09/2026
I do wonder what David Hilbert would think about all this. He was accused of trying to automate mathematics, in the 1920s! The "Hilbert program" failed in an exact sense, because Gödel, but it succeeded by making formal proof systems like Lean possible. And Lean makes the AI-sausage-machine work.
Two panels from the graphic novel Logicomix.
Left: He wants a machine to feed it axioms and make theorems, like one where a pig enters the one side...
Right: ...and the sausages come out from the other!! (laughter)
3749
Reposted by Martin Modrák
Felipe Fontana Vieira @felipefv.bsky.social · 11/09/2026
Next week I will give a free webinar about how I have been using Nix (by itself) but mainly through {rix} for my current articles. If anyone is intested, my plan for the structure of the webinar (in the comments):
11913
Reposted by Martin Modrák
tj mahr 🤘 @tjmahr.com · 10/09/2026
i'm using my solarizeddocx which i made way back when because the default RMarkdown MS Word output looked bad github.com/tjmahr/solar...
github.com
GitHub - tjmahr/solarizeddocx: A refence docx file for pandoc with solarized syntax highlighting
A refence docx file for pandoc with solarized syntax highlighting - tjmahr/solarizeddocx
021
Reposted by Martin Modrák
Mel Andrews @bayesianboy.bsky.social · 11/09/2026
You can now read this invaluable book on methods in philosophy of science open-access. Find me in Chapter 16!
0364
Reposted by Martin Modrák
Luna Fazio @lunafazio.bsky.social · 09/09/2026
Had a Zoom meeting earlier today where a lot of great exchanges were happening in the chat, so we wanted to save the log for later. Zoom exports a plain text file, so I made a tool to convert that into something that's more convenient to interact with. Sharing in case anyone else finds it useful!
Example of what a zoom chat log looks like (fictional conversation)The chat log after being converted into an interactable html
153
Reposted by Martin Modrák
ponder @ponder.ooo · 08/09/2026
lmao what the fuck do you mean it's unlikely but you can't rule it out. do you not know what you're training your models on? are you guys unaware of what's going on in your own operation? does openai research not have any knowledge of what data they train their models on?
we cannot rule out that de-identified data derived from their usage of our products helped improve our models⁠
1528132
Reposted by Martin Modrák
Noah Haber @whaleactually.com · 08/09/2026
... and that's where Registered Revisions comes in The Registered Revisions Meta Trial Pilot Report is OUT NOW!! osf.io/preprints/me... But new(ish) policy involves developing a new(ish) multi-headed trial design, workflows, infrastructure, piloting, mistakes, and a super team. And it's all here.
22117
Reposted by Martin Modrák
Martin Modrák @modrakm.bsky.social · 17/07/2026
Multiverse analysis, abdication of responsibility and manufacturing of doubt: I have written on some downsides I see with multiverse analysis (which I like in principle): arxiv.org/abs/2607.14623 I was inspired/provoked to write it by @dingdingpeng.the100.ci (thanks!)
Abstract: I argue that multiverse analysis is highly suited to two undesirable uses: abdication of researcher's responsibility for their conclusion and manufacturing of doubt. A review of multiverse analyses published in 2025 provides tentative empirical support that abdication of responsibility is present in the literature and I mention anecdotal evidence that multiverse has been used for manufacturing of doubt about Covid-19 precautions. To mitigate negative effects if multiverse analysis becomes widely used I suggest the community adopts two conventions for evaluating multiverse analyzes: evaluating multiverses by the single worst universe they contain and considering large size of a multiverse as a sign of weakness rather than a praiseworthy achievement.
45818
Martin Modrák @modrakm.bsky.social · 07/09/2026
It is a reflection of the remarkable success of the Roman commitment to diversity and inclusion* that almost all of the people it conquered ended up identifying with the empire, even as it's western part was falling apart and even beyond. (*by pre-19th century standards)
020
Reposted by Martin Modrák
Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 04/09/2026
It's a systemic problem in science reporting that these summaries exaggerate the evidence. In the actual candy study, the participants were all students, status was manipulated in the lab by telling some students they were better than others, and "nearly twice" means 1 piece vs 2 pieces.
Piff and his colleagues found that upper-class drivers were more likely to cut other cars off at junctions and ignore pedestrians at crossings. Wealthier people also appeared more willing to lie at work. In one experiment, volunteers were left alone with a jar of sweets ostensibly meant for children. When the researchers returned, upper-class people had snaffled nearly twice as many candies as lower-class people.
1329166
Reposted by Martin Modrák
Kate Starbird @katestarbird.bsky.social · 03/09/2026
Seattle Times comes out against I-638. It s terrible law, based in bigotry, that hurts all girls who want to compete in school sports, requiring invasive sex testing. If you’re in WA state or know someone who is, please spread the word: Vote NO on I-638. www.seattletimes.com/opinion/edit...
seattletimes.com
Seattle Times recommends 'No' on I-638, ban on trans girls in sports | Editorial
If this were a “Washington problem“ it would be worth studying as a pressing issue to be resolved by the electorate, informed with science. But it is not.
8379173
Reposted by Martin Modrák
Matt Makel @mattmakel.bsky.social · 31/08/2026
I made a mistake. And because of that mistake, I no longer have confidence that results that I reported in several research papers are an accurate reflection of replication rates. 1/
19430
Reposted by Martin Modrák
Berna Devezer @devezer.bsky.social · 28/08/2026
OK I have to point this out: So he does know how experiments work because last I remember, he (and colleagues) tried to sell the story that reforms work using a design that did not have a corresponding treatment or control about the reforms, and insisted that there was strong evidence of causation.
Dr. Nosek said that Transfyr would have to present detailed results to prove that this system really does make science better. “Take 50 labs, track half the experiments with this stuff and don’t track the other half — then look for differences in progress,” he suggested.
2313
Reposted by Martin Modrák
Berna Devezer @devezer.bsky.social · 28/08/2026
We need to stop this nonsense of insisting on viewing scientific error as a problem to be eliminated. Scientific error is the fuel we need for scientific progress. Without uncertainty, we don't need science. With forced certainty and required faith, we get religion
311025
Reposted by Martin Modrák
Andrew Gelman et al. @statmodeling.bsky.social · 25/08/2026
Bayesian Workflow free pdf! statmodeling.stat.columbia.edu/2026/08/25/b...
statmodeling.stat.columbia.edu
Bayesian Workflow free pdf! | Statistical Modeling, Causal Inference, and Social Science
17429
Reposted by Martin Modrák
Demetri @phdemetri.bsky.social · 26/08/2026
Bayes doesn't make experiments run faster. Stop saying this dpananos.github.io/posts/2026-0...
dpananos.github.io
Bayes Does Not Make Experiments Faster On Its Own – Demetri Pananos Ph.D
5226