Prof. Dr. Felix Schönbrodt
I want to present a re-analysis of the raw data from two studies that investigated whether physical cleanliness reduces the severity of moral judgments – from the original study (n = 40; Schnall, Benton, & Harvey, 2008), and from a Continue Reading …
In a recent post on the DataColada blog, Uri Simonsohn wrote about “We cannot afford to study effect size in the lab“. The central message is: If we want accurate effect size (ES) estimates, we need large sample sizes (he Continue Reading …
The probably most frequent criticism of Bayesian statistics sounds something like “It’s all subjective – with the ‘right’ prior, you can get any result you want.”. In order to approach this criticism it has been suggested to do a sensitivity Continue Reading …
[Update Oct 2014: Due to some changes to the Bayes factor calculator webpage, and as I understand BFs much better now, this post has been updated …] I started to familiarize myself with Bayesian statistics. In this post I’ll show Continue Reading …
Today a new version (0.23.1) of the WRS package (Wilcox’ Robust Statistics) has been released. This package is the companion to his rather exhaustive book on robust statistics, “Introduction to Robust Estimation and Hypothesis Testing” (Amazon Link de/us). For a Continue Reading …
One critique frequently heard about Bayesian statistics is the subjectivity of the assumed prior distribution. If one is cherry-picking a prior, of course the posterior can be tweaked, especially when only few data points are at hand. For example, see Continue Reading …
[Update June 12: Data.tables functions have been improved (thanks to a comment by Matthew Dowle); for a similar approach see also Tal Galili’s post] The guys from RStudio now provide CRAN download logs (see also this blog post). Great work! Continue Reading …
Maybe you have encountered this situation: you run a large-scale study over the internet, and out of curiosity, you frequently the correlation between two variables. My experience with this practice is usually frustrating, as in small sample sizes (and we Continue Reading …
Update Feb 17, 2014: WRS moved to Github – This installation procedure has been updated and still is valid Some users had trouble installing the WRS package from R-Forge. Here’s a method that should work automatically and fail-safe: [cc lang=”rsplus” Continue Reading …
Update June 2013: A systematic analysis of the topic has been published:Schönbrodt, F. D., & Perugini, M. (2013). At what sample size do correlations stabilize? Journal of Research in Personality, 47, 609-612. doi:10.1016/j.jrp.2013.05.009 Check also the supplementary website, where you Continue Reading …