Hi, I'm
Kristoffer.
I'm a researcher in clinical psychology. I build interactive tools for understanding statistics, and write about quantitative methods and causal inference.
Interactive visualizations
All visualizations →
Writing
All posts →Understanding Odds Ratios and Risk Ratios
An interactive article about odds ratios, risk ratios (relative risk), and risk differences, and why the interpretation of odds ratios is perhaps more odd than expected.
Why Adjusted Regression Coefficients Are Less Descriptive Than They Look
An interactive article about how regression adjustment works and the pitfalls of conditional associations in descriptive studies.
Introducing PowerLMM.js: Browser-based power analysis for longitudinal models with dropout
A new tool for power analysis of longitudinal linear mixed-effects models (LMMs), with support for missing data, random slopes, and non-inferiority and equivalence tests.
The Cohen's d app translation project
My Cohen's d app supports multiple languages, and any help translating the content into more languages is very welcome.
Why linear mixed-effects models are probably not the solution to your missing data problems
Linear mixed-effects models are often used for their ability to handle missing data using maximum likelihood estimation. In this post I will present a simple example of when the LMM fails, and illustrate two MNAR sensitivity analyses: the pattern-mixture method and the joint model.