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Julia Haaf

@juliaha.bsky.social
833 followers 352 following 281 posts

Professor of Psych Methods, Evaluation and Statistics at the University of Potsdam. Bayesian modeling, experimental psychology, and cats. But mainly cats. She/her.

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Reposted by Julia Haaf
Dan Quintana @dsquintana.bsky.social · 19/09/2026
New preprint! 🎉 I analysed 1660 papers from 4 psychology journals and found materials sharing went from 9% of papers in 2015 to 82% in 2025, and these materials *do* get downloaded — a median of 135 times each. BUT shared code is often hard to run. doi.org/10.31234/osf... Let's walk through it 🧵
Two-panel figure. Panel a is a flow diagram tracking 1,611 empirical psychology articles from publication year (545 in 2015, 552 in 2020, 514 in 2025) to repository-link type: 785 link an OSF project, 85 link another platform, and 741 link no repository. Of those with an OSF link, download counts were retrieved for 670 and not retrieved for 115. Panel b is a line chart of the share of empirical papers linking OSF across 2015, 2020 and 2025. The overall rate, shown as a dashed black line, rises from 9% to 57% to 82%. All four journals rise steeply and end close together: Psychological Science 92%, JESP 89%, JML 83%, Cognition 76%, with Psychological Science highest throughout.Three-panel figure. Panel a: ridgeline plot of downloads per file by material type on a log scale, with the percentage never downloaded labelled for each — archive 16% of 545 files, documents 20% of 2,970, code 12% of 3,471, other 17% of 1,646, data 21% of 10,051, media 35% of 2,120, images 35% of 4,102. Most files cluster between 1 and 10 downloads, with long right tails past 100. Panel b: ridgeline plot of downloads per paper by journal, log scale, with dashed median lines; Psychological Science is highest, then JESP, JML and Cognition. Panel c: stacked bars showing, for documents, data and code separately, the share of papers by download band (0, 1–10, 11–100, more than 100) in 2015, 2020 and 2025. The share exceeding 100 downloads falls sharply over time in all three types, from roughly two-thirds in 2015 to a quarter or less in 2025, as the 1–10 band grows.Four-panel figure. Panel a: statistical languages detected among 333 papers with retrievable code — R 88%, SPSS 12%, Stata 4%, SAS 1%. Panel b: code red flags among those 333 papers — 34% hard-code an absolute path, 40% reference a missing file — above documentation among 672 OSF-linked papers — 21% have a README, 30% are documented by README, description or wiki. Panel c: among 562 Elsevier papers with no repository link, 44% (245) host at least one journal supplementary file but only 14% (77) host data, code or an archive. Panel d: composition of those 448 hosted files — documents 52%, data 21%, media 9%, other 7%, archive 6%, code 3%, images 1%. The code panels are green, the journal-supplement panels blue.Coefficient plot (download predictors)

Dot-and-whisker plot of three standardised predictors of OSF download volume, each with a 95% confidence interval. Repository size (number of files) has the largest effect at about 0.76, citations about 0.38, and altmetric attention about 0.12. All three intervals sit entirely above zero, so each predicts more downloads, with repository size roughly twice the effect of citations and six times that of attention. X-axis: standardised effect, −0.2 to 1.0.
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Reposted by Julia Haaf
Josh Grubbs @joshuagrubbsphd.com · 26/08/2026
if we were all "apolitical" and "neutral in the culture war" like Dolly, this world would be a much better and much more progressive place
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Julia Haaf @juliaha.bsky.social · 26/08/2026
I still feel like people should quote Box (1978) instead of the other one. As I understand it, he is basically saying that “Is the model true?” is the wrong question. Therefore, the statement "all models are wrong" is the answer to a *question* that isn't useful.
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Rebecca Sear @rebeccasear.bsky.social · 12/08/2026
Evidence from the US that nuclear families really aren't traditional. They only became the most common household type around the 1940s (larger households including either extended kin or kin and non-kin were common before) and are now on the decline
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Julia Haaf @juliaha.bsky.social · 18/07/2026
Finding the lightest corner of the room to highlight our six WoMP-PRIME Travel & Networking Award winners. Congratulations! @mathpsych.org
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Joe Bak-Coleman @jbakcoleman.bsky.social · 10/07/2026
Ok, problem two here, identify by McElreath is that correlations for assessing predictions is just kind of insane(?), no idea how that made it to print or even past the design phase. There's a pretty rich literature on evaluating predictions of models... bsky.app/profile/rmce...
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lynn @chordbug.bsky.social · 24/06/2026
fixed your headline
A hit song on the Billboard 100 charts is termed *$k$-good* if it is _ever_ in a weekly top-$k$, and *$k$-immediate* if it _debuts_ in the top-$k$.


An artist is *$(n,k)$-Olivian* if their $n$ first $k$-good hits are all also $k$-immediate.

*Headline 1.* Olivia Rodrigo is the first $(10,10)$-Olivian woman.
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Lisa Fazio @lkfazio.bsky.social · 18/06/2026
Real full-circle moment loading- First semester of college I took "Introduction to the mind-brain: psychological, biological, & philosophical perspectives" & fell in love w cognitive psychology. I vividly remember learning about PDP connectionist models & thinking that they were so freaking cool 1/
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Julia Haaf @juliaha.bsky.social · 12/06/2026
We are currently expanding our Attentional Control Data Collection with new data sets. If you have a (public) data set with an attentional control manipulation (such as Stroop, flanker, Simon, negative priming, etc.), then please add! More info here: www.uni-potsdam.de/en/psych-met...
uni-potsdam.de
Attentional Control Data Collection
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Bethany Brookshire @beebrookshire.bsky.social · 22/05/2026
This is...breathtakingly xenophobic. "NIH officials are telling grantees...to remove papers that name co-authors affiliated with foreign institutions if NIH had not previously approved a foreign component for the grant." www.science.org/content/arti...
science.org
U.S. researchers face new restrictions on publishing with foreign collaborators
NIH, NASA grantees are confused and concerned amid agencies’ piecemeal communication
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Julia Haaf @juliaha.bsky.social · 15/05/2026
I only found this series now, but it's a fascinating read! 🤓📖
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Julia Haaf @juliaha.bsky.social · 06/05/2026
This short read by my lab member Nicole Cruz is very much worth reading! Check it out!
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Julia Haaf @juliaha.bsky.social · 28/04/2026
...and a meta science study on peer review?
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Julia Haaf @juliaha.bsky.social · 28/04/2026
New technical paper on power analysis?
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Julia Haaf @juliaha.bsky.social · 20/04/2026
Way too perfect metaphor for our times. Including the fact that it's all televised.
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Julia Haaf @juliaha.bsky.social · 04/04/2026
Fun new (to me) guessing game. Good addition to the nyt games. metazooa.com?utm_source=m...
metazooa.com
Metazooa
Become an evolutionary detective to find the Mystery Animal!
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Julia Haaf @juliaha.bsky.social · 04/04/2026
When you let your kids decide the holiday menu. ("It should have a sad nose, not a happy nose!") 🐛
Caterpillar cake decorated with whipped cream and strawberries, raisin eyes and strawberry leaves as hair.
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Julia Haaf @juliaha.bsky.social · 31/03/2026
One of the parenting skills I am completely lacking is the ability to walk slowly.
media.tenor.com
a judge is sitting at a table in a courtroom pointing at someone .
Alt: a judge is sitting impatiently at a table in a courtroom pointing at her watch.
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Julia Haaf @juliaha.bsky.social · 23/03/2026
So this! What drives me nuts is the stupid Christmas gnome stuff, a current German millennial parents thing. And now there are Easter gnomes. It is pure evil.
Gnome door you are supposed to glue to your wall. The gnome living there is very mischievous and plays a ton of pranks (that the parents have to come up with every day).
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Reposted by Julia Haaf
Mrs. Detective Pikajew, Esq. @clapifyoulikeme.favrd.social · 05/10/2025
FINALLY some good fuckin science www.cell.com/action/showP...
cell.com
Correspondence
Lateralized sleeping positions in domestic cats
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Julia Haaf @juliaha.bsky.social · 17/03/2026
Our lab is currently at #teap2026 in Tübingen, Germany (say hi if you are there!). Yesterday I had a full day of excellent vision, illusion and psychophysics talks (including some magic ✨). Let's see what today brings.
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Julia Haaf @juliaha.bsky.social · 26/02/2026
Only two days left to submit your abstract for this year's @mathpsych.org meeting. Some things to consider: 1. The conference is in Canada. 2. If you cannot attend in person, there is a virtual track. Consider submitting there! You can pick the track during the submission process. See you there!
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Julia Haaf @juliaha.bsky.social · 14/02/2026
I want to be this person at *every* conference. Would be the most (and least) popular person. 🥱🫩
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Preeti Chhibber @runwithskizzers.bsky.social · 09/02/2026
omg everybody go draw a horse this is what the internet was made for gradient.horse
gradient.horse
gradient.horse
Draw a horse, watch it run!
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Julia Haaf @juliaha.bsky.social · 02/02/2026
If you are a PhD student in cognitive science, psychology or linguistics, come visit us in Potsdam! We have short fellowships available for this year (deadline is in two weeks). Shoot me an email if you are interested. Here is the call: linguistlist.org/issues/36/38...
linguistlist.org
LINGUIST List 36.3850 Internships: Cognitive Science, General Linguistics, Language Acquisition, Neurolinguistics, Psycholinguistics: 3- to 4-month Fellowships at the University of Potsdam, CRC1287 L...
The LINGUIST List, International Linguistics Community Online.
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Dr. Katja Thieme (she/they) @katjathieme.bsky.social · 31/01/2026
Academics vying for a spot in Epstein‘s world. There are so many. I feel the need to make a thread, so I don’t keep confusing them. 1/
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Julia Haaf @juliaha.bsky.social · 27/01/2026
To me this is as hopeful as it gets these days. 💜
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Julia Haaf @juliaha.bsky.social · 19/01/2026
First time ever that I understood the utility of a video abstract. Check out Veronika! 🐮
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Jaclyn A. Siegel, PhD @jacasiegel.bsky.social · 06/01/2026
I have been a part of five psychology/public health departments over the years. I wish I could go back in time and tell myself — when I was really struggling and unhappy and felt like I didn’t belong in the field at all — how different your social experience can be from institution to institution.
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Julia Haaf @juliaha.bsky.social · 16/12/2025
Behold! The holiday-aloe. ❄️
An aloe vera plant decorated with Christmas tree decorations and a wooden shovel.
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Merriam-Webster @merriam-webster.com · 15/12/2025
bit.ly/453uzfx
bit.ly
2025 Word of the Year: Slop
Plus 'gerrymander', 'touch grass', 'performative', and other words that defined the year
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cemas_io @cemas.io · 15/12/2025
In Sydney ist es am Sonntag zu einem Terroranschlag auf eine Chanukah-Feier in Bondi Beach gekommen. Rund 2.000 Menschen hatten sich am Strand zu einem fröhlichen Fest versammelt, um die erste Kerze des Chanukah-Leuchters zu entzünden. www.deutschlandfunk.de/zahl-der-tod...
deutschlandfunk.de
Nach Anschlag am Bondi Beach - Zahl der Todesopfer in Sydney auf 15 gestiegen - Regierung will Waffenrecht verschärfen
Die Zahl der Todesopfer des antisemitischen Terroranschlags in Sydney ist auf 15 gestiegen. Sie sind zwischen 10 und 87 Jahre alt. Etwa 40 Verletzte würden im Krankenhaus behandelt, teilte die austral...
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Julia Haaf @juliaha.bsky.social · 10/12/2025
I am so glad to live this close to Berlin sometimes: bmm-charite.de/en/exhibitio...
bmm-charite.de
SLIME | Exhibitions | bmm – Berliner Medizinhistorisches Museum der Charité
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Michael "Shapes Dude" Betancourt @betanalpha.bsky.social · 03/12/2025
So much statistics discourse orbits around Bayes verses frequentist debates, but in practice Bayes verses frequentist is often a false dichotomy. Just as important as the inferential strategy is the underlying model, and how that model is specified. 🧵
A 2x2 table with the four cells:
  I   - “Default Model” x “Frequentist”
  II  - “Default Model” x “Bayesian”
  III - “Bespoke Model” x “Frequentist”
  IV - “Bespoke Model” x “Bayesian”
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Amadeu Antonio Stiftung @amadeuantonio.bsky.social · 27/11/2025
Amadeu Antonio wurde 1990 von einem brutalen Neonazimob ermordet während die Polizei zusah. „Die Baseballschlägerjahre sind nie ganz weg gewesen und in vielen Regionen kommen sie auch wieder", erklärt unser Vorstand @timoreinfrank.bsky.social was es braucht, damit sich die Geschichte nie wiederholt.
www1.wdr.de
Amadeu Antonio: Todesopfer der "Baseballschlägerjahre"
Am 24.11.1990 wird Amadeu Antonio in Eberswalde Opfer eines rassistischen Angriffs. Sein Tod erschüttert das Land und zeigt die Gefahr rechter Gewalt.
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Julia Haaf @juliaha.bsky.social · 26/11/2025
I'll be fine. #teambetty
Betty from Amsterdam Empire is fiercely walking with her dog through the crowded streets of Amsterdam.
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Jens Fünderich @jensfuenderich.bsky.social · 26/11/2025
Inhibiting and facilitating conditions of the h̶u̶m̶a̶n̶ smile: a n̶o̶n̶obtrusive test of the facial feedback hypothesis (Strack et al., 1988)
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Julia Haaf @juliaha.bsky.social · 26/11/2025
Rosenthal (1979). The file drawer problem and tolerance for null results.
Ginger cat in a drawer of a dark wood cupboard. That cat looks like someone you would like to know about.
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Julia Haaf @juliaha.bsky.social · 24/11/2025
New hobby: finding the right cat meme for a famous psychology paper. Example: Cronbach's 1957 "The two disciplines of scientific psychology"
Two skinny white cats sitting so that it looks like one cat with two heads.
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Andrew Gelman et al. @statmodeling.bsky.social · 03/11/2025
The Netherlands Food and Consumer Product Authority at the Netherlands Food and Consumer Product Authority is looking for an applied statistician with expertise in Bayesian statistics or causal inference statmodeling.stat.columbia.edu/2025/11/03/t...
statmodeling.stat.columbia.edu
The Netherlands Food and Consumer Product Authority at the Netherlands Food and Consumer Product Authority is looking for an applied statistician with expertise in Bayesian statistics or causal infer...
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Berna Devezer @devezer.bsky.social · 26/10/2025
formalizing this process is fraught. This requires a bottom up cultural change starting with doctoral training. Top down impositions such as citation diversity statements come with a lot of other risks.
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Julia Haaf @juliaha.bsky.social · 13/10/2025
In serious fall mood over here. 🍁🍂 Chestnuts, pumpkins, walks in the forest, please! youtu.be/DnKOzdEa80A?...
youtu.be
Billie Eilish - Bad Guy (Pumpkin Cover)
YouTube video by Pupsi
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Julia Haaf @juliaha.bsky.social · 27/09/2025
Sometimes my cat sounds like someone forgot to turn off the vibration alarm on their phone...
Frank the cat covered by a yellow blanket. He looks cozy but a little concerned.
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Candice Morey @candicemorey.bsky.social · 26/09/2025
Call for collaborators! 🧵 The TL;DR: we seek collaborators on a #ManyLabs #RegisteredReport about what causes rapid forgetting. In-principle accepted Stage 1: osf.io/ahjn5 Expressions of interest: cardiffunipsych.eu.qualtrics.com/jfe/form/SV_... Further details in the 🧵:
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Julia Haaf @juliaha.bsky.social · 22/09/2025
It is a common theme in academia to forget that faculty also get paid to do research and write papers. Getting paid doesn't mean no intellectual contribution to a paper, otherwise unpaid interns would be the only authors on papers.
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Jakub Szymanik @szymanikjakub.bsky.social · 05/09/2025
Join our interdisciplinary team that combines computational linguistics with cognitive neuroscience! Our center is located in the beautiful Trentino region.
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Julia Haaf @juliaha.bsky.social · 24/08/2025
Why is it that everyone on the internet seems to be so damn comfortable with prior/posterior plots using ggplot that do not use the same y-axis density values. Drives me nuts. Sunday rant over.
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JK Flake @jkflake.bsky.social · 21/08/2025
Help us show there is support for offering registered reports at one of Psychology's leading method's journal! chng.it/TwwnVBScVb
chng.it
Adopt Registered Reports at Psychological Methods
Can you spare a minute to help this campaign?
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Jaclyn A. Siegel, PhD @jacasiegel.bsky.social · 21/08/2025
Three of my collaborators have COVID RIGHT NOW 😷 😷 😷
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