Kristoffer Magnusson

PhD, Lic. Clinical Psychologist

Hi, I'm Kristoffer, a postdoctoral researcher in clinical psychology. This is my personal page about R, statistics, psychotherapy, open science, and data visualization.


Interactive Visualizations

Since 2014 I've created various interactive tools to teach statistics.

Maximum Likelihood

Cohen's d

Statistical Power and Significance Testing

Confidence Intervals

Bayesian Inference


Equivalence and Non-Inferiority Testing

P-value distribution


R Software

powerlmm: Power Analysis for Longitudinal Multilevel Models

The purpose of powerlmm is to help design longitudinal treatment studies (parallel groups), with or without higher-level clustering (e.g. longitudinally clustered by therapists, groups, or physician), and with missing data.