R

Continuous Interactions in Multiple Regression in R

A brief vignette on incorporating interactions with continuous predictors.

Stratified Norms

A demonstration of a custom function for generating stratified random samples from an arbitrary number of factors.

The Grammar of (Interactive) Graphics

Lecture slides from a presentation on the structure and implementation of interactive graphics.

Splitting a Dataframe by Cluster

A demonstration of a custom function for splitting a dataframe while accounting for a cluster variable. Primarily intended for use with multi-level models.