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Julia Haaf

@juliaha.bsky.social
836 followers 353 following 284 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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Julia Haaf @juliaha.bsky.social · 04/10/2026
Same here. But alas, the cookies were too attractive...
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Julia Haaf @juliaha.bsky.social · 04/10/2026
I felt really good about sending this picture to the parents, solely because of the fruit platter. Of course none of the kids ate any fruit/veg, but at least we tried! I personally always crave healthy and salty stuff when making cookies.
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Julia Haaf @juliaha.bsky.social · 04/10/2026
There can't ever be too many eyes on baked goods!
Dinosaur cookies in the decoration process. Several cookies are decorated with a varying number of sugar eyes.
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Julia Haaf @juliaha.bsky.social · 23/09/2026
Could you share your slide? 🙃
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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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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
Agreed! Sometimes the quote is slightly misused in discussion as an evasion strategy without actually addressing the subtext. Oh, you think my model is wrong? Yeah, but all of them are wrong. I think all the other things he said about models as abstractions of the world provide more advancement.
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Julia Haaf @juliaha.bsky.social · 26/08/2026
"...since it springs from a physical view of the behavior of gas molecules. For such a model there is no need to ask the question “Is the model true?”. If “truth” is to be the “whole truth” the answer must be “No”. The only question of interest is “Is the model illuminating and useful?”."
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Julia Haaf @juliaha.bsky.social · 26/08/2026
"... For example, the law PV = RT relating pressure P, volume V and temperature T of an “ideal” gas via a constant R is not exactly true for any real gas, but it frequently provides a useful approximation and furthermore its structure is informative..."
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Julia Haaf @juliaha.bsky.social · 26/08/2026
Sorry, it seems I forgot the alt text. The quote is: "Now it would be very remarkable if any system existing in the real world could be exactly represented by any simple model. However, cunningly chosen parsimonious models often do provide remarkably useful approximations..."
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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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Julia Haaf @juliaha.bsky.social · 23/08/2026
Aw, could become friends with Brötchen! youtube.com/shorts/PdfrL...
youtube.com
Cuteness alert: Meet "Brötchen", Berlin Zoo’s adorable pygmy hippo | DW News
YouTube video by DW News
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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 · 31/07/2026
... so... you don't travel with your own Tupperware?
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Julia Haaf @juliaha.bsky.social · 30/07/2026
I have a recipe like this from my grandma. I think it just says "milk".
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Julia Haaf @juliaha.bsky.social · 30/07/2026
That's not American, just old-school. I offered my mother in law a scale when she started baking a cake and she looked at me like I am an idiot. She measured some things by table spoon but everything else was just a feeling. Of course the cake was perfect.
static.klipy.com
Dog Side Eye Rolling Window Up
Alt: Dog Side Eye Rolling Window Up
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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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Julia Haaf @juliaha.bsky.social · 14/07/2026
Yes, I think many thought we are either wizards or monsters. But honestly I think part of it is the long parental leave. If you have to go back to work after three months you need at least *some* sleep. There needs to be some regulation way earlier than here.
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Julia Haaf @juliaha.bsky.social · 14/07/2026
When we moved to Germany, people around us were in total awe at the fact that our 2,5 yo could fall asleep by himself and would stay asleep in his own room throughout the night. Sleeping alone and (the own) sleep quality does not seem to be a priority for German parents. 🤷‍♀️
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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
Also, if you know of a data set that might fit, please let me know.
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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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Julia Haaf @juliaha.bsky.social · 05/06/2026
I never really understood how people could feed this to their innocent little babies...
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Julia Haaf @juliaha.bsky.social · 05/06/2026
Pureed meats are my worst nightmare. But also a good band name.
Asking Google: what kind of music would a band play that is called pureed meats?
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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 · 20/05/2026
Lol the figure. Will add this to my data visualization slides for next week.
A really bad graph
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Julia Haaf @juliaha.bsky.social · 15/05/2026
Yes please! :D
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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 · 12/05/2026
7. Try to dissolve the pill in a teaspoon of flour. The flour will serve as throat powder so that there is no saliva left the pill could stick to. If you don't have flour try food starch or powdered sugar.
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Julia Haaf @juliaha.bsky.social · 12/05/2026
"this may be difficult if you can't swallow the gummy bear." 🙄
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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
@joachim.cidlab.com I think you might appreciate it.
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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
I blame my sister. She always made me run to school simply because her legs were twice the length of mine.
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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 · 26/03/2026
And it's really really good!
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Julia Haaf @juliaha.bsky.social · 26/03/2026
Living the good Mensa life.
Two vegan Mensa offers. The first is rice pudding with apple sauce, cinnamon and sugar (Germans love sweet lunch). The second offer is massaman curry with sweet potatoes, chick peas and cilantro, served with rice.
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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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Mrs. Detective PikaBOO, 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
This is my brain relaxation music. Perfect for writing. www.youtube.com/watch?v=37hJ...
youtube.com
Nouvelle Vague - Dancing With Myself (Full Track)
YouTube video by Kwaidanrecords
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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
Life must be tough as a linguist. 😏
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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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