The JASP Blog

JASP 0.9.1 has been released and is now available on our download page. It includes the following new features: Compute columns using a drag-and-drop interface or R code Improvements in classical linear regression Bootstrap confidence intervals of coefficients Cook’s distance (case-wise diagnostics) Partial plots Improvements in ANOVA Homogeneity corrections: Brown-Forsythe and Welch Show df for contrast analysis Option to not…

More and more educational resources for JASP are constantly being developed, and it can be difficult to obtain a quick overview. This is why we have revamped our teaching page to include a collection of the most important educational resources. You can take a look here. We also wanted to provide an overview of where in the world JASP is…

Tl;dr: The flagship journal of social psychology, JPSP, has just implemented a variety of measures that promote responsible research practices. A watershed moment for open science, this news felt like a bolt from the blue — but only because I did not take the editor’s word for it… The Journal of Personality and Social Psychology (JPSP) may be the flagship…

The 30th Annual Convention of the Association for Psychological Science takes place this weekend in San Francisco. Johnny van Doorn and myself will present JASP on two different occasions: We will present JASP at the Open Science Pavilion. You can drop by to say hi, collect some JASP stickers, or get a sneak peek at the upcoming version of JASP…

Soon we will release JASP 0.8.6. In this post we preview three important new features. 1. Frequentist Multinomial and Chi-Square Tests JASP 0.8.6 provides frequentist multinomial and chi-square tests. For count data, users can test whether the cell frequencies are equal (i.e., the multinomial test), but users are free to specify any pattern of expected frequencies (or probabilities) and test…

To obtain the title of doctor at a Dutch university, a PhD candidate has to publicly defend his or her dissertation. This comes with certain traditions that I’d to share my thoughts on. But before I do, here’s the link to my layman’s talk my PhD defence Until recently, only full professors had the legal right to promote a “drs”…

The first version of SPSS was published 59 years ago. The first version of JASP was published three years ago. How does an expensive IBM-developed program compare to the free and open source program which was until recently just developed by a handful of scientists? My approach for this review is as a university lecturer in psychology. Ease of learning…

John Tukey is famous. In his youth he coined the term “bit” (as an abbreviation of “binary information digit”), later he promoted exploratory data analysis, and throughout his entire life he worked on a broad range of statistical techniques, some of which carry his name. In 1991, Tukey published the article “The philosophy of multiple comparisons”. The paper starts with…

In a previous blog post I mentioned an open letter that a group of 27 social psychologists, methodologists, and advocates for open science had sent to Dr. Shinobu Kitayama, incoming editor of Journal of Personality and Social Psychology: Attitudes and Social Cognition (JPSP:ASC). The letter was motivated by a recent editorial in JPSP:ASC in which Dr. Kitayama stated his desire…

This week the JASP team organized their third annual workshop in Amsterdam. Below you’ll find some of the highlights. A select set of course materials is here. The plenary lectures were given by Richard Morey and E.J. Wagenmakers; special thanks goes out to Johnny van Doorn for dealing with the logistics, and to Quentin Gronau for helping out in general. The…