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Stephan Hollander

@stephanhollander

Professor @TilburgU School of Economics and Management. Computational linguistics, text-as-data, and Python (@ThePSF) enthusiast. ZEPH 3 17

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20.09.2023
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Latest posts by Stephan Hollander @stephanhollander

🏷️ @aleximas.bsky.social

06.03.2026 03:23 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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NY State Senate Bill 2025-S7263 Imposes liability for damages caused by a chatbot impersonating certain licensed professionals.

NY is proposing to "Impose liability for damages caused by a chatbot impersonating certain licensed professionals." nysenate.gov/legislation/... How does a chatbot trick you into thinking its a doctor? Senators: If you forgot you were conversing with AI, you need a doctor.

05.03.2026 22:58 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Ok I'm in a rabbit hole. If you search "how many decisions do we make in a day" the reported number is almost always 35,000, often reported that this is according to "multiple sources". Yet I can't actually find a single source that backs up that number. Anyone know where this number comes from?

05.03.2026 23:37 πŸ‘ 18 πŸ” 5 πŸ’¬ 6 πŸ“Œ 0

Spicy take of the day: there are _always_ unmeasured confounders. We just make value judgements over how much they matter with respect to Y
#statsky #rstats

26.09.2025 07:22 πŸ‘ 21 πŸ” 2 πŸ’¬ 2 πŸ“Œ 2
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[ #GenAI-post warning] Almost every researcher I know is using Claude Code, and talking about the huge productivity gains. Are we actually producing more scientific papers yet? Since its release in May 2025, arXiv submissions are indeed *12%* above what we'd expect. Details in thread:

23.02.2026 23:47 πŸ‘ 28 πŸ” 3 πŸ’¬ 4 πŸ“Œ 2

Looks very promising! Thanks for sharing it here

06.02.2026 05:08 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Our paper β€œInferring fine-grained migration patterns across the United States” is now out in @natcomms.nature.com! We released a new, highly granular migration dataset. 1/9

05.02.2026 17:30 πŸ‘ 70 πŸ” 27 πŸ’¬ 2 πŸ“Œ 5

Love the NLP: thoughtful application @economist.com

06.02.2026 02:50 πŸ‘ 8 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

'Taxi' and 'cab' essentially mean the same thing, but 'cab' doesn't come from 'taxicab.'

It comes from β€˜cabriolet,’ which was a type of light carriage.

β€˜Taxi’ comes from β€˜taximeter,’ which is the device that calculates the amount of a fare based on the distance traveled.

28.01.2026 20:42 πŸ‘ 733 πŸ” 131 πŸ’¬ 13 πŸ“Œ 16
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GitHub - reifjulian/strgroup: Match strings based on their Levenshtein edit distance. Match strings based on their Levenshtein edit distance. - reifjulian/strgroup

I've released a new version of strgroup, a Stata command that does fuzzy string matching. No new functionality, but the underlying C code has been optimized: it now uses much less memory and runs about 5 times faster
github.com/reifjulian/s...

27.01.2026 15:57 πŸ‘ 28 πŸ” 9 πŸ’¬ 1 πŸ“Œ 1

Here in Europe, I often hear British English–style pronunciations like DAH-ta, STAH-ta, and LAH-techβ€”quite consistent?

04.01.2026 19:18 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
How to pronounce "Stata" - Jason Kerwin From the Statalist FAQΒ (emphasis mine): 4.1 What is the correct way to pronounce β€˜Stata’? Stata is an invented word. Some pronounce it with a long a as in day (Stay-ta); some pronounce it with a short...

Classic question! (LaTeX fans know the struggle.) According to this discussion jasonkerwin.com/nonparibus/2... I’m guessing they leave it up in the air?

03.01.2026 05:16 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Open Studio with Pop-Up Store:
Friday December 12, 16-19h
Saturday December 13, 11-18h
Join us at:
Studio Christoph Niemann
SchrΓΆderstrasse 2
10115 Berlin
shop.christophniemann.com

07.12.2025 11:13 πŸ‘ 29 πŸ” 3 πŸ’¬ 1 πŸ“Œ 1
"Captain Gains" on Capitol Hill
Shang-Jin Wei & Yifan Zhou
WORKING PAPER 34524
DOI 10.3386/w34524
ISSUE DATE November 2025
Using transaction-level data on US congressional stock trades, we find that lawmakers who later ascend to leadership positions perform similarly to matched peers beforehand but outperform them by 47 percentage points annually after ascension. Leaders' superior performance arises through two mechanisms. The political influence channel is reflected in higher returns when their party controls the chamber, sales of stocks preceding regulatory actions, and purchase of stocks whose firms receiving more government contracts and favorable party support on bills. The corporate access channel is reflected in stock trades that predict subsequent corporate news and greater returns on donor-owned or home-state firms.

"Captain Gains" on Capitol Hill Shang-Jin Wei & Yifan Zhou WORKING PAPER 34524 DOI 10.3386/w34524 ISSUE DATE November 2025 Using transaction-level data on US congressional stock trades, we find that lawmakers who later ascend to leadership positions perform similarly to matched peers beforehand but outperform them by 47 percentage points annually after ascension. Leaders' superior performance arises through two mechanisms. The political influence channel is reflected in higher returns when their party controls the chamber, sales of stocks preceding regulatory actions, and purchase of stocks whose firms receiving more government contracts and favorable party support on bills. The corporate access channel is reflected in stock trades that predict subsequent corporate news and greater returns on donor-owned or home-state firms.

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Figure 2: Estimated dynamic quasi-difference-in-differences coefficient, di, of equation(3), with vertical dashed lines representing 90 percent confidence intervals. The point estimate of the year in which the lawmaker became a congressional leader (Year 0) is normalized to zero. BHAR over the 250 days following each trade is the dependent variable and calculated using the Fama-French five-factor plus momentum as the benchmark model.

什 1 1 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 7 8 9 Year Figure 2: Estimated dynamic quasi-difference-in-differences coefficient, di, of equation(3), with vertical dashed lines representing 90 percent confidence intervals. The point estimate of the year in which the lawmaker became a congressional leader (Year 0) is normalized to zero. BHAR over the 250 days following each trade is the dependent variable and calculated using the Fama-French five-factor plus momentum as the benchmark model.

After becoming a congressional leader, a politician’s stock portfolio beats out those of peers by 47 (!!!) percentage points a year through trades timed around bills and firms that later get government contracts

www.nber.org/papers/w34524

via @florianederer.bsky.social

03.12.2025 01:42 πŸ‘ 1434 πŸ” 629 πŸ’¬ 32 πŸ“Œ 83
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Interesting paper highlight that binning can be misspecified in panel settings - this drives misinterpretation of extreme temperature shocks. #linkoftheday

www.dropbox.com/scl/fi/1ya6z...

29.11.2025 13:34 πŸ‘ 71 πŸ” 18 πŸ’¬ 5 πŸ“Œ 4

In light of record submission rates and a large volume of AI-generated slop, SocArXiv recently implemented a policy requiring ORCIDs linked in the OSF profile of submitting authors, and narrowing our focus to social science subjects. Today we are taking two more steps:
/1

27.11.2025 14:54 πŸ‘ 287 πŸ” 144 πŸ’¬ 4 πŸ“Œ 23
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GitHub - BenjaminGor/Latex_Notes_Tutorial: Latex Book/Note Writing Tutorial Latex Book/Note Writing Tutorial. Contribute to BenjaminGor/Latex_Notes_Tutorial development by creating an account on GitHub.

How to Reproduce this Book Exactly with LaTeX - great resource for writing Latex #linkoftheday
github.com/BenjaminGor/...

22.11.2025 17:58 πŸ‘ 23 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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This is terrifying.

"[AI agents] can... infer a researcher's latent hypotheses and produce data that artificially confirms them."

...

"We can no longer trust that survey responses are coming from real people" -@seanjwestwood.bsky.social

18.11.2025 21:03 πŸ‘ 312 πŸ” 121 πŸ’¬ 7 πŸ“Œ 17

NBER grants to fund research into economic measurement - I find this agenda very compelling and important #linkoftheday
www.nber.org/news/nber-la...

13.11.2025 13:31 πŸ‘ 34 πŸ” 17 πŸ’¬ 0 πŸ“Œ 2

Oof, this is super slick! Go check it out πŸ‘‡πŸ»

11.11.2025 21:46 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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This paper’s been popping as β€œevidence” that you can’t do real #causalinference w/ obs data. To me it shows you need rigorous pre-specified design (in addition to the willingness to fold when your hypothesis is not possible to answer with the data at hand). #EpiSky, #CausalSky, #AcademicSky

22.10.2025 14:59 πŸ‘ 9 πŸ” 4 πŸ’¬ 2 πŸ“Œ 1
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🚨Next time you hire, don’t take it easy! In a new working paper, @elliottash.bsky.social, Jason Sockin, and I show the difficulty of the interview signals to workers whether the job is a good fit. 🚨

Paper link: papers.ssrn.com/sol3/papers....

31.10.2025 22:06 πŸ‘ 31 πŸ” 9 πŸ’¬ 1 πŸ“Œ 0

Do any other languages (Dutch, German, Spanish) share this quirk, or is English alone in having a verb whose past tense is an exact anagram of its base form?

30.10.2025 21:41 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Are there any other English verbs whose past tense is formed by simply rearranging the same letters (with no additions or deletions) as their present tense β€” like eat β†’ ate? I can’t think of another example #NLP #linguistics

30.10.2025 05:40 πŸ‘ 5 πŸ” 1 πŸ’¬ 2 πŸ“Œ 1
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This study uses computational methods, including #AI, to analyze textbooks from public, religious private, & home schools, focusing on how they portray people, topics, & values over time.

Read: papers.ssrn.com/sol3/papers....
Subscribe: www.ssrn.com/index.cfm/en...

#AICommunity

23.10.2025 14:48 πŸ‘ 2 πŸ” 5 πŸ’¬ 1 πŸ“Œ 0
FT graph showing massive UK public support for the opinion that it was wrong to vote to leave the EU.

FT graph showing massive UK public support for the opinion that it was wrong to vote to leave the EU.

Ah! Good morning, reality. And welcome. We’ve been expecting you…

20.10.2025 06:43 πŸ‘ 10631 πŸ” 2783 πŸ’¬ 603 πŸ“Œ 264

Added Finance job decomposition, and Federal Reserve Bank/Board jobs (zero so far this year...)

09.10.2025 02:17 πŸ‘ 13 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0
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MIT-hoogleraar Pattie Maes: β€˜Niemand snapt hoe taalmodellen werken, ook de bedrijven erachter niet’ Terwijl bedrijven zoals OpenAI en Nvidia vol gas geven in de race naar superintelligentie, waarschuwt de Belgische MIThoogleraar voor de gevaren.

MIT-hoogleraar Pattie Maes: β€˜Niemand snapt hoe taalmodellen werken, ook de bedrijven erachter niet’

07.10.2025 08:44 πŸ‘ 3 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

🏷️ @barriosecon.bsky.social

05.10.2025 05:48 πŸ‘ 3 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

Thanks for sharing @florianederer.bsky.social Now that’s art β€” a true masterpiece!

04.09.2025 04:10 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0