05
Jun

2017

2017

2 Comments

Prelude: When you start with R and try to estimate a standard ANOVA , which is relatively simple in commercial software like SPSS, R kind of sucks. Especially for unbalanced designs or designs with repeated-measures replicating the results from such software in base R may require considerable effort. For a newcomer (and even an old […]

29
May

2017

2017

Together with David Kellen I am currently working on an introductory chapter to mixed models for a book edited by Dan Spieler and Eric Schumacher (the current version can be found here). The goal is to provide a theoretical and practical introduction that is targeted mainly at experimental psychologists, neuroscientists, and others working with experimental […]

26
May

2017

2017

It took us quite a while but we have finally released a new version of rtdists to CRAN which provides a few significant improvements. As a reminder, rtdists [p]rovides response time distributions (density/PDF, distribution function/CDF, quantile function, and random generation): (a) Ratcliff diffusion model based on C code by Andreas and Jochen Voss and (b) […]

03
Apr

2016

2016

1 Comments

I have just submitted a new version of rtdists to CRAN (v. 0.4-9). As I haven’t mentioned rtdists on here yet, let me simply copy it’s description as a short introduction, a longer introduction follows below: Provides response time distributions (density/PDF, distribution function/CDF, quantile function, and random generation): (a) Ratcliff diffusion model based on C […]

05
Mar

2016

2016

1 Comments

I have recently restarted working with Stan and unfortunately ran into the problem that my (hierarchical) Bayesian models often produced divergent transitions. And when this happens, the warning basically only suggests to increase adapt_delta: Warning messages: 1: There were X divergent transitions after warmup. Increasing adapt_delta above 0.8 may help. 2: Examine the pairs() plot […]

24
Oct

2015

2015

10 Comments

This post has been updated: 1. July 2016: Updates thanks to comment of Frederik Eaton 2. April 2016: Included downloading and building recommended package (I couldn’t check packages requiring recommended packages without that). 29. March 2016: Updated r-devel.sh script as it stopped working (Thanks to Matt Flor for noticing that). Before submitting an R package […]