A simulation of a two-group parallel-arm randomized trial with interim analysis using the rpact package.

This post goes through the R code and logic that was used to construct the figures and concepts in Rafi & Greenland (2020) BMC MRM.

Sensitivity analyses are an important part of statistical analyses, however, there are major misconceptions about what they do and what qualifies as such an analysis.

Experienced statisticians and data analysts are familiar with stories where a coding error has led to an entire conclusion changing, even leading to a retraction. It's the sort of stuff that keeps people up at night.

An early look at Gelman et als new book, Regression and Other Stories, which is an update to their seminal 2006 book, Data Analysis Using Regression and Multilevel Hierarchical Models.

A discussion of events that transpired in the past year, where a group of surgical researchers promoted calculating post-hoc power using the observed effect size, despite warnings from several statisticians.