Author: Kristoffer Magnusson

This will be a non-technical post illustrating the problems with identifying treatment responders or non-responders using inappropriate within-group analyses. Specifically, I will show why it is pointless to try to...continue reading.

In this post I will show some of the new simulation features that will be available in powerlmm 0.4.0. You can already install the dev version from GitHub. # GitHub...continue reading.

My R package powerlmm 0.3.0 is now out on CRAN. It can be installed from CRAN https://cran.r-project.org/package=powerlmm or GitHub https://github.com/rpsychologist/powerlmm. New features This version adds support for raw effect sizes,...continue reading.

Here’s the slides from a talk I gave recently at Stockholm University: “Power Analysis for Longitudinal 2- and 3-Level Models: Challenges and Some Solutions Using the R Package powerlmm”. The...continue reading.

My R packge powerlmm 0.2.0 is now out on CRAN. It can be installed from CRAN https://cran.r-project.org/package=powerlmm or GitHub https://github.com/rpsychologist/powerlmm. Changes in version 0.2.0 New features Analytical power calculations now...continue reading.

Over the years I’ve produced quite a lot of code for power calculations and simulations of different longitudinal linear mixed models. Over the summer I bundled together these calculations for...continue reading.