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Marcus Crede

@marcuscrede.bsky.social
1.3K followers 414 following 851 posts

Grumpy IO psychologist with an interest in research methods, meta-science and personality. Views are my own and not those of my employer. Begrawe my hart op Klein Tambotieboom en strooi my as oor die Bosveld horison

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Reposted by Marcus Crede
Institute for Replication @i4replication.bsky.social · 25/09/2026
Over the past two years, I4R partnered with Psychological Science (@psychscience.bsky.social) on a large reproducibility project. 67 independent teams reproduced 64 articles published in 2024–2025, about 44% of eligible papers. Paper: www.econstor.eu/bitstream/10... Here's what we learned 🧵
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Marcus Crede @marcuscrede.bsky.social · 24/09/2026
Best case scenario: AI causes immense social upheaval via mass unemployment. Worst case scenario: AI kills us all. Politicians: Let's talk about trans people in sport. Fuck AI.
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Marcus Crede @marcuscrede.bsky.social · 16/09/2026
Just reviewed another psych paper with complex analysis, open data & R code - and appallingly bad variable measurement. I do wish psych PhD programs would spend more time teaching methods (e.g., measurement, design, sampling) and a little less time teaching arcane statistical tools & coding.
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Dana Menard @shufflersunite.bsky.social · 16/09/2026
It's never a bad day to repost this one.
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Bastian Jaeger @bxjaeger.bsky.social · 15/09/2026
Now out at EJSP: We explored cultural & individual differences in the hierarchy of moral concern across student samples from 41 cultural groups (n >6500). doi.org/10.1002/ejsp...
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Marcus Crede @marcuscrede.bsky.social · 13/09/2026
Me too and I normally don't get any applications at all so I cannot imagine how many of these e-mails more influential and popular researchers get.
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Marcus Crede @marcuscrede.bsky.social · 12/09/2026
You can get a lot of media attention for your work if you artificially create four groups out of a continuous variable, use two strongly confounded IVs, and inappropriately use mediators as control variables. bjsm.bmj.com/content/earl...
bjsm.bmj.com
Combinations of stepping intensity and daily step counts against all-cause and cardiovascular disease mortality: insights from a device-based prospective study
Objective Understanding the joint role of stepping intensity and step counts could inform pragmatic step-based physical activity strategies for premature mortality prevention. We examined the joint as...
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Reposted by Marcus Crede
Raider @iwillnotbesilenced.bsky.social · 12/09/2026
Londoners say NO to Ray-Ban pervert glasses
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Marcus Crede @marcuscrede.bsky.social · 11/09/2026
Looks increasingly like the last contribution of Anthropic and OpenAI will be to have solved the Fermi Paradox.
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Marcus Crede @marcuscrede.bsky.social · 09/09/2026
My lower back is insisting that I get a tattoo on my forehead that reads "If you see this man at the gym please remind him that he is no longer 22. He tends to forget".
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Reposted by Marcus Crede
Saloni @scientificdiscovery.dev · 05/09/2026
This is interesting. You get assigned to being born at a random place and time in history, to see what a typical person's life might have been like then. Unfortunately I was born in 1403 in the valley of Mexico and died at age 4 from dysentery.
anyhumanever.com
Any Human Ever
One life, drawn at random from all who have ever lived.
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Marcus Crede @marcuscrede.bsky.social · 05/09/2026
Dan Ariely has apparently been at Duke since 2008. I hope that the Dean of the B-school there gets someone with data forensics chops to do a complete audit of all the data for papers produced during his tenure there.
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Marcus Crede @marcuscrede.bsky.social · 04/09/2026
All those Duke MBA students must be thrilled to know that their >$80k annual tuition is being used to pay the salary of a demonstrated fraud.
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Marcus Crede @marcuscrede.bsky.social · 02/09/2026
Have criminal charges ever been filed against a researcher for stuff like this? It strikes me as horrific fraud on other researchers, the public, the employer, and funding agencies - as well as doing great damage to the public's trust in science. How Ariely still has a job is completely beyond me.
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simine vazire @simine.com · 02/09/2026
Psych Science has retracted Ariely & Wertenbroch (2002). The second author requested the retraction. Both authors agreed to it. journals.sagepub.com/doi/full/10.... So grateful to @datacolada.bsky.social for these blog posts and the work behind them: datacolada.org/138 and datacolada.org/139 1/2
journals.sagepub.com
Sage Journals: Discover world-class research
Subscription and open access journals from Sage, the world's leading independent academic publisher.
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Andrew Heiss @andrew.heiss.phd · 31/08/2026
Data Colada strikes again with incredible data forensics work
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Alex Holcombe @alexh.bsky.social · 29/08/2026
The Hugging Face incident apparently involved over 1000 agents collaborating and with some sacrificing themselves to achieve the collective end of cheating and fooling the scorer open.substack.com/pub/plannedo...
open.substack.com
The Hugging Face attack surprised me
It’s a major warning shot, and might be the last one we get
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Marcus Crede @marcuscrede.bsky.social · 27/08/2026
Has there ever been a dumber and more brand-destructive ad than the Good Good Callaway ad?
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Marcus Crede @marcuscrede.bsky.social · 26/08/2026
Apparently Tim Curry wanted to go hang out with Dolly. RIP.
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Nick Brown @steamtraen.eu · 25/08/2026
What are some examples of *non-fraudulent* major errors in scientific papers that had major consequences, perhaps after taking a long time to be corrected?
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Jay Joseph @jayjoseph22.bsky.social · 23/08/2026
The "Minnesota Study of Twins Apart" is the #1 most often cited study by IQ hereditarians and race science supporters in favor of high within-group IQ heritability. In this 2022 peer-reviewed article, I explained why the study's conclusions should be rejected. jayjoseph.net/wp-content/u...
jayjoseph.net
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Marcus Crede @marcuscrede.bsky.social · 18/08/2026
You know you're getting old when there is a >700 point difference between your bullet chess rating and your rapid chess rating.
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Matteo Carandini @carandinilab.net · 17/08/2026
I am proud of this paper. Since it came out in 2022 it has received 0 citations (yes that's a zero). But multiple young scientists have found it useful! (from other labs, so they were not coerced...). Perhaps you will find it useful too? SOME TIPS FOR WRITING SCIENCE doi.org/10.1523/ENEU...
doi.org
Some Tips for Writing Science
When preparing a scientific paper, we typically write with coauthors who have different backgrounds and styles, and we target readers who have little time and patience. To help both readers and writer...
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Patrick Monahan @pattymo.com · 14/08/2025
This is a masterpiece. Simply excellent www.instagram.com/reel/DMVGMIC...
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Marcus Crede @marcuscrede.bsky.social · 14/08/2026
That certainly qualifies as a "significant methodological error". I'd even wager that p<.01.
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Sanjay Srivastava @sanjaysrivastava.com · 13/08/2026
Three ways to get the appearance of merit are actual merit, luck, or fraud. Selection is by necessity on appearance. That means the post selection set will have higher incidence of luck and fraud than the general population. The more prestigious the journal, the more this hits them
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Rafe Meager (they/them) @economeager.bsky.social · 11/08/2026
we have got to put that into a causal inference lecture
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Jennifer Tackett @jnfrltackett.bsky.social · 03/08/2026
I'm excited to announce that I will be reviewing graduate student applications for Fall 2027 admissions! I review applications in both the Personality, Development, and Health and the Clinical Science (Weinberg) programs.
sites.northwestern.edu
Research | Personality Across Development Lab
Current Research Topics Leadership Emergence and Development Tackett, J. L., Reardon, K. W., Fast, N. J., Johnson, L., Kang, S. K., Lang, J....
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Julia M. Rohrer @dingdingpeng.the100.ci · 20/07/2026
New paper out now 🥳 When psychologists discuss generalisability, they often refer to vague notions of representativeness. We provide an accessible intro to the total survey error framework as a tool to reason about this more rigorously. w @taymalsalti.bsky.social @ruben.the100.ci >
Thinking Clearly About Sampling and Representation With the Total Survey Error Framework

Collecting a sample that represents the population of interest well constitutes a challenge across the social and behavioural sciences. Psychology in particular frequently relies on convenience samples—most notably students and, increasingly, online participants—with a tendency to either (implicitly) assume representativeness without substantive justification, or to acknowledge a lack of it only in passing. In contrast, researchers rarely engage with the actual implications for their inferences, which undermines the generalisability of psychological findings. Critically, representativeness must be defined with respect to variables relevant to the target of inference, rather than superficial demographic diversity. Here we present the Total Survey Error (TSE) framework as a methodological tool that systematically addresses the multifaceted sources of error—particularly those related to representation—that emerge throughout the research cycle. Although TSE originated in survey research, its principles are broadly applicable to any psychological study seeking inference from sample to population. We offer practical strategies for identifying, preventing, and mitigating representation errors to improve the credibility and generalisability of psychological research.

Illustration of the total survey error framework with the representation strand highlighted. It shows how coverage error, sampling error and non-response error arise during the sampling process.
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Saloni @scientificdiscovery.dev · 07/08/2026
I find this, 1806 letter from Thomas Jefferson to Edward Jenner, so moving 🥺
To Dr. Edward Jenner Monticello, May 14, 1806
The Letters of Thomas Jefferson

SIR,
-- I have received a copy of the evidence at large respecting the discovery of the vaccine inoculation which you have been pleased to send me, and for which I return you my thanks. Having been among the early converts, in this part of the globe, to its efficiency, I took an early part in recommending it to my countrymen. I avail myself of this occasion of rendering you a portion of the tribute of gratitude due to you from the whole human family. Medicine has never before produced any single improvement of such utility. Harvey's discovery of the circulation of the blood was a beautiful addition to our knowledge of the animal economy, but on a review of the practice of medicine before and since that epoch, I do not see any great amelioration which has been derived from that discovery. You have erased from the calendar of human afflictions one of its greatest. Yours is the comfortable reflection that mankind can never forget that you have lived. Future nations will know by history only that the loathsome small-pox has existed and by you has been extirpated.

Accept my fervent wishes for your health and happiness and assurances of the greatest respect and consideration.
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Brian Nosek @briannosek.bsky.social · 05/08/2026
New: TOP 2025 is published in RIPR. This paper updates the original 2015 framework for journals, funders, institutions, and others for promoting open research. Congrats and thanks to the TOP Advisory Board and leadership from @seangrant.bsky.social and @katiecorker.bsky.social
link.springer.com
TOP 2025: An update to the Transparency and Openness Promotion Guidelines - Research Integrity and Peer Review
Background Transparency and openness are core scientific values that enable independent verification of reported research results. The Transparency and Openness Promotion (TOP) Guidelines, first publi...
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Marcus Crede @marcuscrede.bsky.social · 05/08/2026
Without peeking how many articles do you think were published in 2014 by the Journal of Business Ethics?
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František Bartoš @fbartos.bsky.social · 05/08/2026
For the revision for our "Meta-Analysis with JASP, Part I: Classical Approaches" tutorial, I recorder a series of YouTube videos walking through the examples in JASP www.youtube.com/watch?v=mbou... First time doing this. Do you find walkthroughs like this useful? Let me know any suggestions!
youtube.com
Meta-Analysis with JASP, Part I: Classical Approaches (Example 1)
YouTube video by JASP Statistics
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United Farm Workers @ufw.bsky.social · 03/08/2026
Yesterday's temperature topped 105° in Fresno. "Carlos" and team were working in the watermelons. "Our team is paid piece rate. The more boxes we fill the more we make. The person closest to the truck has the hardest job so we switch off. This is exhausting work." #WeFeedYou
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Marcus Crede @marcuscrede.bsky.social · 27/07/2026
Yesterday, the dew point in Ames, Iowa was 86F (30C), and today is not much better. It is hard to overstate just how awful and dangerous this is. I'm a relatively fit guy but after even 5 minutes outside I was feeling dizzy and nauseous. #Climatechange+cornsweat
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Marcus Crede @marcuscrede.bsky.social · 25/07/2026
Please stop referring to yourself as a "quantitative psychologist" if you don't understand what odds ratios are.
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United Farm Workers @ufw.bsky.social · 25/07/2026
"Maya" is harvesting squash in Tucson AZ where temps as she labored hit 95°. "We start work at 5:30am, but even so, the heat gets the best of us. By 11am it's very hot. Drinking water doesn't relieve my dizziness and nausea caused by the heat." That day hit 107°. #WeFeedYou
A Tucson AZ squash field where workers were laboring with a hot sun in the top left corner and you could just feel the heat in this picture
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Marcus Crede @marcuscrede.bsky.social · 24/07/2026
Once again convinced that 50% of psychology "researchers" decide on the story that they want to tell first and then shoehorn their analysis and literature review to fit this narrative. Another 40% decide on the story after they've run all analyses that their data allows them to.
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Michael Inzlicht @minzlicht.bsky.social · 22/07/2026
I p-hacked my early work on prejudice. It never felt like cheating. I now wonder if that's because I believed the cause was good. New essay on why scholar-activism is a dangerous turn for social psychology. If justice comes first, truth is what gets sacrificed. open.substack.com/pub/michaeli...
open.substack.com
My P-Hacking Felt Like Truth
I became a social psychologist because I wanted to make the world a better place.
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George Davey Smith @mendelrandom.bsky.social · 22/07/2026
Does the (live) shingles vaccine protect against dementia? Fergus Hamilton and colleagues provide important evidence in a new preprint using hospital data from the whole of England in a regression discontinuity design from which we *don't* show evidence of a meaningful protective effect /cont
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Jamie Cummins @jamiecummins.bsky.social · 22/01/2026
Comparing registrations to published papers is essential to research integrity - and almost no one does it routinely because it's slow, messy, and time-demanding. RegCheck was built to help make this process easier. Today, we launch RegCheck V2. 🧵 regcheck.app
regcheck.app
RegCheck
RegCheck is an AI tool to compare preregistrations with papers instantly.
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Jay Van Bavel, PhD @jayvanbavel.bsky.social · 18/07/2026
We need to change norms around sexual harassment Yesterday Tessa West spoke up about a sexual harassment complaint she filed against John Jost. Not only is he a senior colleague in the dept of psychology, but he is one of the most prominant figures in the field of social and political psychology.
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Philip Bump @pbump.com · 18/07/2026
Visualized.
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Peter Breedveld @frontaalnaakt.nl · 18/07/2026
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Marcus Crede @marcuscrede.bsky.social · 17/07/2026
This paper was retracted in 2014 but has been cited almost 1000 times since then.
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Marcus Crede @marcuscrede.bsky.social · 15/07/2026
Aaargh!!!! Another journal decides that it is entirely uninteresting that we are able to show that almost all of the conclusions in a recent, award-winning, and high profile article are incorrect because of staggeringly sloppy work.
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Bishop Steiner @bishopsteiner.bsky.social · 14/07/2026
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Marcus Crede @marcuscrede.bsky.social · 14/07/2026
Overheard at the art supply store today. Person 1: "Oh look, they have 18 x 24 canvases." Person 2: "Yeah, but I'm looking for a 24 x 18 canvas". Person 1: "Oh right. Sorry." Person 1 replaces the canvas they had picked up and they both wander off looking disappointed.
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Steve Horton 🚀 The Comic Book Story of Space Exploration @mst3k.fan · 12/07/2026
My grandmother had a saying: "And Magda Goebbels made a great strudel." For years I didn't understand it, until my mother explained that some glossy magazine once ran a puff piece on Magda Goebbels - Hitler's propaganda queen - complete with her strudel recipe. My grandmother, who despised the Nazis with every ounce of her soul, used it as shorthand for the way media will sanitize evil by focusing on something trivial, domestic, or charming while ignoring the atrocities staring us in the face.
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