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Reproducibility and Meta-Analyses: Two Great Concepts That Apparently Don’t Mix

[Excerpts taken from the report “Examining the Reproducibility of Meta-Analyses in Psychology: A Preliminary Report” by Daniel Lakens et al., posted at MetaArXiv Preprints ] “…given the broad array of problems that make it difficult to evaluate the evidential value…

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Positive Findings are Drastically Lower in Registered Reports

[From slides prepared for the talk “Positive result rates in psychology: Registered Reports compared to the conventional literature” by Mitchell Schijen, Anne Scheel, and Daniël Lakens, presented at Open Science 2019 @ZPID, Trier , and posted at OSF] Conclusion: “Positive result rate in…

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Don’t Abandon It! Learn (and Teach) to Use It Correctly

[From the paper “The practical alternative to the p-value is the correctly used p-value” by Daniël Lakens, posted at PsyArXiv Preprints] “I do not think it is useful to tell researchers what they want to know. Instead, we should teach…

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IN THE NEWS: Undark (March 21, 2019)

[From the article “Stats Experts Plead: Just Say No to P-Hacking” by Dalmeet Singh Chawla, published in Undark] “For decades, researchers have used a statistical measure called the p-value — a widely-debated statistic that even scientists find difficult to define — that is…

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Somebody Asks, How Can A Theory Be Falsified? Twitter Responds

[From the Twitter thread started by @JessieSunPsych] Jessie Sun (@JessieSunPsych) relayed the following question that was raised at a recent Psychology conference: “At what point can a theory be falsified (e.g., if the effect size is d = .02)? We often…

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Redefining RSS

[From the blog “Justify Your Alpha by Decreasing Alpha Levels as a Function of the Sample Size” by Daniël Lakens, posted at The 20% Statistician] “Testing whether observed data should surprise us, under the assumption that some model of the data is…

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Should Science Do More Replications? It Depends

[From the recent working paper, “The Costs and Benefits of Replication Studies” by Coles, Tiokhin, Scheel, Isager, and Lakens, posted at psyarxiv.com/c8akj] “The debate about whether replication studies should become mainstream is essentially driven by disagreements about their costs and benefits,…

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A Roundtable Podcast on the Merits of Lowering the Threshold for Statistical Significance to 0.005

This past week, the International Methods Colloquium hosted a conference call on a recent proposal to reduce the threshold of statistical significance to 0.005.  Participants included Daniel Benjamin, Daniel Lakens, Blake McShane, Jennifer Tackett, E.J. Wagenmakers,  and Justin Esarey, all…

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2017 Leamer-Rosenthal Award Winners Announced

Each year, the Berkeley Initiative for Transparency in the Social Sciences (BITSS) awards prizes to researchers who have made substantial contributions to improving transparency in research practices. The prizes are names after Ed Leamer (economics) and Robert Rosenthal (psychology) through…

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REED: Post-Hoc Power Analyses: Good for Nothing?

Observed power (or post-hoc power) is the statistical power of the test you have performed, based on the effect size estimate from your data. Statistical power is the probability of finding a statistical difference from 0 in your test (aka…

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