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Thinking about evidence and vice versa
Site URL: datacolada.org/
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Posts: 10
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[139] Artificial Deadlines (Part 2): Retrograding Ariely & Wertenbroch (2002)
Published: September 2, 2026 13:10
As described in our previous post (.htm), back in 2006 ariely@mit.edu sent three Excel spreadsheets, each “last saved” by user “Dan Ariely”, to then-PhD-student-but-now-full-professor Kyle Hyndman. Those spreadsheets contained the data required to…
[138] Artificial Deadlines (Part 1): Evidence of Fraud in an Influential Study About Procrastination
Published: August 31, 2026 13:00
A new paper in Psychological Science (.htm) reports a failure to replicate Study 2 of Ariely and Wertenbroch’s influential article entitled, “Procrastination, Deadlines, and Performance: Self-Control by Precommitment.” The original study, published in…
[137] OSF Will Stop Accepting Your Research Files, You Can Use ResearchBox Instead
Published: August 11, 2026 16:18
The Open Science Framework (OSF) was launched in 2012 and almost overnight became the leading platform for the preservation and sharing of scientific data, materials, and analysis code. It made it far easier to endorse open science by making it easier to…
[136] Metadata Falsificada: The Cover-Up File in Gino v. Harvard
Published: July 3, 2026 11:00
Francesca Gino’s lawsuit against Harvard is still ongoing. (The trial, if it gets to that, is scheduled for December 2026) While the case drags on, both sides keep filing documents with the court, and most of those documents are publicly available (htm).…
[134] Figuring Out Figure 1
Published: March 19, 2026 12:02
A few years ago our Journal Club discussed an interesting methods paper entitled, “Putting Psychology to the Test: Rethinking Model Evaluation Through Benchmarking and Prediction” (.htm). This post describes my attempt to understand what’s happening in…
[133] Heterofriendly: The Intuition for Why You Always Need Robust Standard Errors
Published: March 2, 2026 12:00
When I taught my first PhD-level methods course, I invited students to submit questions about any topic in statistics or methodology. Six out of 10 students asked about the same topic: robust & clustered standard errors. It's clearly a topic they found…
[132] statuser: R in user-friendly mode
Published: February 16, 2026 13:00
t.test(), the R function for running t-tests, is disconcertingly imperfect. A t-test involves computing the difference between two means. And yet, t.test(), does not report… …said difference of means.  It reports the p-value for the difference of means, it…
[131] Bending Over Backwards: The Quadratic Puts the U in AI
Published: December 10, 2025 12:01
For a recent journal club in Barcelona, we read a just published article in the Journal of Experimental Psychology: General (JEP:G). The paper is on the impact of using gen-AI on creativity. The paper proposes an inverted U: people are most creative with…
[130] ResearchBox: Even Easier to Use and More Transparently Permanent than Before
Published: November 17, 2025 12:03
Over the past 10 years or so, posting data, code, and materials for published papers has gone from eccentric to mundane. There are a few platforms that enable sharing research files, including ResearchBox. ResearchBox is hosted by the Wharton Credibility…
[129] P-curve works in practice, but would it work if you dropped a piano on it?
Published: September 23, 2025 11:00
P-curve is a statistical tool we developed about 15 years ago to help rule out selective reporting, be it p-hacking or file-drawering, as the sole explanation for a set of significant results. This post is about a forthcoming critique of p-curve in the…