Exact P-Values Upon Request: Breaking with an APA Guideline

The 6th edition of the APA style manual (American Psychological Association, 2010) states the following on the topic of reporting p-values: “When reporting p values, report exact p values (e.g., p = .031) to two or three decimal places. However, report p values less than .001 as p < .001. The tradition of reporting p values in the form p…

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Interesting Read: ‘Chancing It’ by Robert Matthews

In 34 short chapters, Prof. Robert Matthews provides an engaging tour of practically relevant topics whose treatment benefits from a little “common sense expressed in numbers”. These topics include lotteries, insurance, casinos, and the law. This book distinguishes itself favorably from others in its genre. The chapters are well written and relatively concise, making the work ideally suited for readers…

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Two Summer Workshops in Amsterdam

This year we organize two summer workshops in Amsterdam – the first focuses on Bayesian cognitive modeling, and the second focuses on Bayesian statistics with JASP. Before I outline the content of these workshops, let me recount how it was that bitter envy drove me to practical Bayesian modeling. A little over 10 years ago, in a small guest office…

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A New 5-Minute Video Introducing JASP

Our new introduction video demonstrates the basic functionality of JASP. In just under 5 minutes, the demo discusses data editing, the user-friendly GUI, the presence of both classical and Bayesian analyses, the ways in which JASP facilitates statistical transparency, and more. The video was voiced by Alexander Etz. Editing and animations were made by Alexandra Sarafoglou and Tim Draws. The…

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The Mysterious VS-MPR

For its frequentist analyses, JASP offers familiar output: effect sizes, confidence intervals, and p-values. However, JASP also provides a more mysterious measure: the "Vovk-Sellke maximum p-ratio" or VS-MPR.

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