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Arthur Katossky

@katossky

Des maths, de l'informatique et un twist de sciences sociales

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23.10.2023
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Latest posts by Arthur Katossky @katossky

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Skills are among the most consequential new tools for AI, and Anthropic just released a very impressive nontechnical Cowork Skill that builds Skills, including doing interviews & providing benchmarks through parallel tests

I think you still need to add the human touch but this is a big leap forward

06.03.2026 17:16 👍 78 🔁 5 💬 2 📌 0

@coulmont.bsky.social I'm sure you wouldn't able to do this in R, would you?

06.03.2026 17:53 👍 7 🔁 0 💬 1 📌 0

I raise

06.03.2026 17:14 👍 139 🔁 36 💬 4 📌 6

You can use [[ instead of $ to avoid partial matching.

06.03.2026 08:04 👍 1 🔁 0 💬 0 📌 0

@monsieurphi.bsky.social

06.03.2026 07:54 👍 1 🔁 0 💬 0 📌 0

Crosstabs can be charted in this way with less information loss by making the horizontal bars thick according to the row sums.

Of course, there may be a trade-off between minimizing information loss in this way and maximizing audience engagement.

(Don't have the data to redo the whole thing).

05.03.2026 16:56 👍 6 🔁 1 💬 1 📌 1

Ever heard of Marimo?

05.03.2026 17:20 👍 0 🔁 0 💬 1 📌 0
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Credit Where Credit is Due: Mary Eleanor Spear Exploring the life and work of an overlooked mid-century dataviz pioneer who may have discovered the Box Plot 17 years before John Tukey.

#TodayinHistory #dataviz #Onthisday #OTD 📊
🎂Mar 4, 1897 Mary Eleanor Spear born in Jonesboro, Indiana, USA 🇺🇸

A data vis specialist at the Bureau of Labor Statistics, she pioneered the boxplot and wrote books on effective graphic techniques (done by hand!)
👀 bit.ly/4baeFSY

05.03.2026 01:49 👍 9 🔁 2 💬 0 📌 0
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Parfois, les recrutements à l'université se font sur plusieurs disciplines (par ex. histoire contemporaine et anthropologie, ou maths appli et informatique) : l'observation de ces croisements sur 12 ans donne cet espace de l'interdisciplinarité.

04.03.2026 08:22 👍 32 🔁 17 💬 5 📌 1
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Lots of headlines use phrases like 'realistic possibility', but how do people interpret this?

New post, with insights from over 150,000 human judgements about probability-based phrases: kucharski.substack.com/p/insights-f...

01.03.2026 13:38 👍 15 🔁 3 💬 0 📌 0
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Introducing CAPphrase (Comparative and Absolute Probability phrase dataset), an open access dataset containing over 150,000 probability-based language judgements: adamkucharski.github.io/CAPphrase/

26.02.2026 10:45 👍 40 🔁 14 💬 1 📌 3

This recent RCT of an "AI stethoscope" claims the technology "shows promise" for diagnosing cardiovascular conditions.

It does not.

It is a textbook example of the risks of conducting unprincipled 'per protocol analyses'. Once again, peer review at a major medical journal has failed.

🧵 1/

25.02.2026 16:44 👍 419 🔁 184 💬 8 📌 31

High impact political intervention right now:
Lobby states to build just the payment infrastructure to send 1 €/$/₱ to all residents. Use any type of program as an excuse.
The need for UBI will be obvious soon enough, but setting up verification and fraud-prevention will be a serious bottleneck.

23.02.2026 21:51 👍 7 🔁 1 💬 1 📌 0

"Errors in your code mean you're doing something cool!" 😊

(spotted in a tutorial)

23.02.2026 05:30 👍 5 🔁 2 💬 0 📌 1
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Would anybody like to read one of my long threads about a 2.5bn year old rock, bacteria that could produce oxygen but not consume it, and tank production in wwii

23.02.2026 06:14 👍 480 🔁 126 💬 20 📌 44

I think that’s like 80% of the hate. 10% is the truncated printing. 5% is lack of row names.

21.02.2026 17:39 👍 8 🔁 1 💬 0 📌 0
Top panel: My plot of US adult female and male height distributions, which are much narrower, and overlap less than in the figure from Fuentes, which is in the bottom panel.

Top panel: My plot of US adult female and male height distributions, which are much narrower, and overlap less than in the figure from Fuentes, which is in the bottom panel.

1. After I posted my critical review of @anthrofuentes.bsky.social Sex is a Spectrum, a colleague pointed out that his figure of adult heights by sex (bottom panel👇) can't be right: there aren't that many US adults shorter than 4' or taller than 7'

Turns out Fuentes' data are made up 🧪 #BioAnth 🧵

20.02.2026 22:20 👍 32 🔁 9 💬 3 📌 0
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GitHub - paulgp/claude-container Contribute to paulgp/claude-container development by creating an account on GitHub.

In case folks are looking for a convenient way to containerize their claude code instances, here's a way to use Docker on your mac machine to isolate YOLO-ing claude instances.

github.com/paulgp/claud...

11.02.2026 13:52 👍 51 🔁 8 💬 5 📌 3

One element drawn = one line in the dataset. Easier to reason about when you want to see, say, the equivalence between a line graph and a scatterplot.

18.02.2026 20:59 👍 1 🔁 0 💬 0 📌 0
Tribune dans la Gazette du Palais : « OQTF : Mensonges et préjugés » 

Contenu de l’article trop long, accessible ici => https://bit.ly/4tICSIg

Tribune dans la Gazette du Palais : « OQTF : Mensonges et préjugés » Contenu de l’article trop long, accessible ici => https://bit.ly/4tICSIg

Tribune : « OQTF : Mensonges et préjugés » (in Gazette du Palais)

Face au déferlement d'inepties sur les OQTF, quelques rappels (basiques) s'imposent.

En particulier, parler d'« *un* OQTF » est erroné & déshumanisant, car réduit une personne à une simple mesure administrative.

=> bit.ly/4tICSIg

18.02.2026 07:50 👍 85 🔁 38 💬 2 📌 2

In the large: Mortality in France, 1816-2016.

17.02.2026 21:56 👍 220 🔁 73 💬 11 📌 14

Nice! Can you have plots in there? 😇

17.02.2026 21:26 👍 0 🔁 0 💬 1 📌 0

myRegressionModel_2.old

17.02.2026 21:24 👍 1 🔁 0 💬 0 📌 0

_La fin du bipartisme_ ou _Un diagramme en barre qui aurait pu être em un diagramme en ligne_ 😅

15.02.2026 19:34 👍 1 🔁 0 💬 0 📌 0
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The motherhood penalty isn’t as large as we think And event-study designs aren’t the be-all end-all to empirical economics

On why the motherhood penalty may be overestimated. Simply put: The identifying variation comes from women having kids at different points in time, which might not be a valid counterfactual. open.substack.com/pub/plausibl...

15.02.2026 16:21 👍 36 🔁 4 💬 5 📌 2
Great graphic showing cities on a triangle graph showing if they are most oriented to public transit, active mobility or cars.

Great graphic showing cities on a triangle graph showing if they are most oriented to public transit, active mobility or cars.

Have you seen this? This recent study of mode share (the % share of transportation trips that are by car, transit, walking, biking etc) relative to city size and income levels in almost 800 cities in 61 countries. Interesting results. HT @davidzipper.bsky.social
www.sciencedirect.com/science/arti...

13.02.2026 05:23 👍 372 🔁 166 💬 16 📌 26

🧪🏺 Update - authors have new paper showing how useless gen- #AI is for archaeological illustration.
All 400 images were multiply inaccurate (physically, socially, technologically, environmentally), even with improved prompts.

JUST USE HUMAN EXPERTS & ARTISTS

www.cambridge.org/core/journal...

13.02.2026 18:09 👍 642 🔁 249 💬 28 📌 33

LCP
@LCP
"En République il n'y a pas d'indésirables", martèle 
@NunezLaurent
. "Qui allez-vous convaincre de ces contrôles au faciès qui n'existent pas ? Une amende forfaitaire délictuelle est toujours adossée à une infraction". #QAG #DirectAN

[Extrait vidéo de Nunes à l'Assemblée nationale]

2:32 PM · 11 févr. 2026
·
39,4 k
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LCP @LCP "En République il n'y a pas d'indésirables", martèle @NunezLaurent . "Qui allez-vous convaincre de ces contrôles au faciès qui n'existent pas ? Une amende forfaitaire délictuelle est toujours adossée à une infraction". #QAG #DirectAN [Extrait vidéo de Nunes à l'Assemblée nationale] 2:32 PM · 11 févr. 2026 · 39,4 k vues

Pour le ministre de l'intérieur, les « contrôles au faciès n'existent pas »... (🙃)

Pourquoi diable, alors :

- La @courdecassation.fr a condamné l'Etat pour contrôles aux faciès;

- En 2025, la CEDH a condamné la France pour ce motif;

- En 2025, le Défenseur des droits a souligné leur persistance.

11.02.2026 20:48 👍 595 🔁 349 💬 26 📌 14
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Quand la police fait le tri à l’Assemblée nationale - Projet Arcadie Quand la police outrepasse ses droits à l’Assemblée nationale, en bloquant les invités d’un député. Récit d’un bras de fer surréaliste et démesuré.

Hier, le député Abdelkader Lahmar avait invité des militants du DAL à l'AN pour une conférence de presse.
Les CRS, sur ordre de la préfecture, ont refusé de les laisser passer, au point qu'il a fallu solliciter l'intervention de la première questeure.

11.02.2026 07:01 👍 296 🔁 260 💬 17 📌 15
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Il y a plus de 28 000 policiers municipaux en France. C'est +45% en 10 ans.
Cette semaine, le Sénat étudiait un projet de loi pour renforcer les pouvoirs des polices municipales, y compris en matière judiciaire.
Explications pour @dallozactu.bsky.social www.dalloz-actualite.fr/flash/police...

06.02.2026 08:55 👍 5 🔁 6 💬 1 📌 0