This project is part of the collaborative grant application @sajedehra.bsky.social described here: bsky.app/profile/saje.... You will be working with my team - do reach out to any current or past lab members to learn why this is a great environment to do metascientific research.

We are inviting applications for a two-year postdoctoral position in a collaborative meta-science project on the effectiveness of data and code sharing policies in research-performing organizations. www.tue.nl/en/working-a...

How replicable are results in the social sciences? It depends, but on what? Closeness of replication and strength of evidence! 100% for high quality studies with strong evidence!!! "Insanity is doing a different study and expecting the same result!" (Einstein) replicationindex.com/2026/04/13/h...

Replicability is 44, is about as meaningful as saying the meaning of life is 42. Here I show how we can move on from estimating average replicability. replicationindex.com/2026/04/13/h...

Another biased p-curve estimate. 99% power. LOL Uri blames the data.

Evidential value across established and emerging disease associations: A P-Curve and Z-curve analysis of Periodontal Disease literature #NeuroDegeneration 🧪🧠 https://www.researchsquare.com/article/rs-9377174/latest

#Metascience Science is self-correcting, academics are not. Here is a case study of an academic avoiding to admit that their method is flawed. replicationindex.com/2026/04/08/t...

New blog post (it's been a while): Make Meta-Analysis Great Again. This is a serious proposal. Please amplify to whoever might be interested, especially if they have money. steamtraen.blogspot.com/2026/04/make...

The Journal of Pseud-Scientific Psychology that published the Bem paper hasn't really changed despite badges, adversarial collaborations, and multiverse analyses. The real test is openness to real criticism. replicationindex.com/2025/12/05/w...

David against Goliath, Asterix against the Roman empire. We love the underdog. Well, here the underdog in statistics lands a punch in the face of giant Gelman. Two statisticians who want to remain anonymous verified the claim. replicationindex.com/2026/04/02/g...

I bet $1,000 that this claim is false. How can economics be worse than psychology that has 90% success rates and less than 50% power and sample sizes in the double digits. Something went wrong here somewhere for such a general claim.

A history of the top marginal tax rates on the wealthiest Americans: 1940: 81% 1950: 84% 1960: 91% 1970: 72% 1980: 70% 1990: 28% 2000: 40% 2010: 35% For 50 years, corporate backed politicians in Congress have slashed taxes to line the pockets of their wealthy donors.

Gelman tells us how to respond to criticism. But what if the criticism is invalid? Here I show how to respond to valid and invalid criticism. replicationindex.com/2026/03/31/l...

When a 5,000 citation paper gets shredded, does it make a sound? (not when word war III is happening).

#Metascience Button et al.'s Power Failure is a seminal meta-science paper. But it has a major flaw. It confuses unconditional power (median power of all studies, 21%) with conditional power (power / H1 is true). This has big implications for discussions of false positives.

When three reviewers (1 human, 2 AI) spot the same fatal flaw, why did the authors not see it or ask AI for a pre-submission review? replicationindex.com/2026/03/05/d...

Oversight Democrats have been investigating the handling of serious allegations by a survivor against Donald Trump when she was a minor. We have now confirmed that some of the documents related to this survivor appear to be missing from the files. Here’s what we know ⬇️

Meta-psychology is the scientific study of psychological scientists' behavior. They like z-curve as much, as rats liked a Skinner box. Too bad. Now you know how it feels to be a subject and not a participant.

Blogging is therapy. replicationindex.com/2026/02/18/a...

Babbage, 1830, discussing the problem that scientists selectively report findings that they want to be true. Confirmation bias is a strong human tendency. This is why we need to design science in a way that prevents conformation bias from leading us away from the truth.

In standard scientific reports in psych 96% of first mentioned main hypotheses are supported. In Registered Reports, this is 46%. The 96% is clearly biased (given true H1 rate and power). Lack of transparency means we do not know the true baserate. journals.sagepub.com/doi/10.1177/...

The replication crisis is only over when psychology journals stop publishing such biased articles that blame replication failures on replicators and not the use of p-hacking in original studies. Pathetic. replicationindex.com/2026/02/13/r...

Is this finally the baseball quote, where somebody compared their 1/3 success rate to a 33% batting average in baseball?

I think it's best for everyone to understand that the unified class project of billionaires right now is to do to white collar workers what globalization and neoliberalism did to blue collar workers.

A Federal judge in Oregon ruled that ICE can NOT use chemicals on protestors for exercising their 1st amendment rights. youtu.be/gvL9ckyrDTM?...

I am not a doctor. I am a doctor of philosophy. That just means I doctored my dissertation. 😃😁😇

I want to laugh at it but sadly it’s true.

Next level simulation work. The simulation is still running and you can check the results as they accumulate. Z-curve produces 95% CI with 95% coverage even with k = 50 sig. results across many realistic scenarios. replicationindex.com/2026/02/03/c...

A retiree wrote this email to a DHS attorney. Within five hours, DHS demanded Google turn over records for his account. A Kafkaesque form of domestic surveillance, intimidating Americans for lawful speech. New from us at the Post: www.washingtonpost.com/investigatio... @johnwoodrowcox.bsky.social

The hidden power of anonymous peer reviewers in legacy journals with closed peer-review. Maybe just publish in open, scientific journals like Meta-Psychology. replicationindex.com/2026/02/03/h...

Based on the amazing FReD replication explorer, I finally have some evidence for the claim that the observed replication rate is lower in social than in disciplines like cognitive psychology forrt.org/FReD-apps/ex... 1/

Didn't Bem describe his PSI experiments as rhetorical devices? daniellakens.blogspot.com/2025/09/type...

Another AI gem: 1. Articles optimize for novelty; books optimize for understanding Maybe journal culture and performance indicators like H-index killed social science. Tower of bable. Every article starts with a new framework, no integration possible. Yes, I am writing a book.

old wine in new bottles, but if you haven't seen this preregistered p-hacked 9 study article yet, take a look It even comes with a response by the authors, no we did not p-hack, but they did. replicationindex.com/2026/01/18/p...

How do you respond to the concerns about z-curve that z-curve is a selection model and should not be used when there is no selection bias??? replicationindex.com/2026/01/27/z...

Ian Austin, an Army veteran, was arrested for protesting ICE in Minneapolis. But he’s continued protesting. Senior reporter @julialurie.bsky.social spoke to him. “When they say, ‘Why would you be out here?’ How the fuck could I not be out here?” he says. “My nation is under attack."

This was a really great discussion with people pushing the boundaries of scientific resesrch in their ManyMany projects. Really the cutting edge of scientific knowledge generation!

Me: Erik, you made a mistake in your simulation. Sometimes there were no false positives to detect missing non-significant tests of true H0 Erik: I’m not interested in more pointless discussions with you. I can do without your insults and misrepresentations. replicationindex.com/2026/01/24/o...

The problem is not AI. The problem is human ab/users. SPSS did not phack either

The existing reproducibility crisis is exacerbated by publication pressure. Lack of incentives for replication studies & funding difficulties make science vulnerable. AI could worsen this by enabling rapid generation of plausible but flawed papers. #Reproducibility 3/6

There is huge heterogeneity in effect sizes. So, what does the zero average tell us. What is needed and real work is to figure out the moderators. Until then, we do not know how and why inequality is correlated with mental health across nations. But we know, poverty is bad.

Really no bias? How likely are 7 p-values between .05 and .005 in a preregistered article? replicationindex.com/2026/01/18/p...

"We find that questionable research practices (QRPs) are widespread across all fields of research and seniority levels. Yet, younger, more prolific researchers, and those dismissing the seriousness of QRPs admitted to more QRPs" journals.plos.org/plosone/arti...

Here is something fun you can do with AI. Have it score academic debates like a soccer match. Informative and entertaining. replicationindex.com/2026/01/18/s...

New study shows Portugese researchers engage in questionable research practices (sometimes frequently), even though most admit these are problematic. QRPs studied are mainly related to integrity, but includes hypothesizing after results are known. journals.plos.org/plosone/arti...

Remember: The real freeloaders in this country are the rich — not the poor or immigrants or any other group of people vilified as scapegoats. The richest 1% evade $163 billion in taxes every year. The United States literally has yacht and private jet tax deductions. Hello?

The main bank account holding revenue from the Venezuelan oil sales is located in Qatar. “There is no basis in law for a president to set up an offshore account that he controls so that he can sell assets seized by the American military,” Sen. Elizabeth Warren. www.semafor.com/article/01/1...

@erik-van-zwet.bsky.social posted his critic of z-curve on Gelman's blog. Here is the response. replicationindex.com/2026/01/13/r...