Throughout his books, Bayesian godfather Sir Harold Jeffreys was in the habit of starting each chapter with an epigraph. Usually these epigraphs came from different sources, but not so for his 1935 geophysics book “Earthquakes and mountains”. The book has a total of seven chapters; here are the seven associated epigraphs:   For chapter 1, “Solids and Liquids”: …but who…

Last week I attended the 84th Annual Meeting of the Psychometric Society in Santiago, Chili. Together with Maarten Marsman I taught a JASP workshop on Monday, and then gave a keynote on Tuesday. The keynote was called “Bayesian multi-model inference for practical and impractical problems” and you can find the slides here. Due to poor planning on my side, I…

This post was written the week before the birth of our daughter Leanne, who finally decided to make an appearance on Valentine’s Day this year. Nataschja is lying on our sofa, watching a series on Netflix. It is Tuesday afternoon and I am working from home. In fact, I have been working from home for about a week now, awaiting…

This post is an extended synopsis of Sarafoglou A., Hoogeveen S., Matzke D., & Wagenmakers, E.-J. (in press). Teaching Good Research Practices: Protocol of a Research Master Course. Preprint available on PsyArXiv: https://psyarxiv.com/gvesh/ Summary The current crisis of confidence in psychological science has spurred on field-wide reforms to enhance transparency, reproducibility, and replicability. To solidify these reforms within the scientific…

This post is an extended synopsis of van Doorn, J. B., Matzke D., & Wagenmakers, E.-J. (in press). An In-Class Demonstration of Bayesian Inference. Psychology Learning and Teaching (https://doi.org/10.1177/14757 25719848574). Preprint available on PsyArXiv:https://psyarxiv.com/d8bvn/ Abstract Over 80 years ago, Sir Ronald Fisher conducted the famous experiment “The Lady Tasting Tea” in order to test whether his colleague, Dr. Muriel Bristol,…

This post is an extended synopsis of a preprint that is available on arXiv: http://arxiv.org/abs/1905.02068 Abstract Booming in business and a staple analysis in medical trials, the A/B test assesses the effect of an intervention or treatment by comparing its success rate with that of a control condition. Across many practical applications, it is desirable that (1) evidence can be…

An often voiced concern about p-value null hypothesis testing is that p-values cannot be used to quantify evidence in favor of the point null hypothesis. This is particularly worrisome if you conduct a replication study, if you perform an assumption check, if you hope to show empirical support for a theory that posits an invariance, or if you wish to…