A short examination of constructing interactions terms for continuous variables for multiple regression models in R.

Models for nominal/ordinal item level data.

Quick overview of converting from wide format data to long format for a 3x3 repeated measures dataset.

A nice feature of `ggplot2` is the ability to apply differing coordinate systems. While most often graphics are expressed on Cartesian coordinates, sometimes it is interesting to use different bases. In this gist, I show a few applications of polar coordinates.

A quick description of how transforming different elements in a ggplot2 object produces differing results.

Relationship between Smoking and Exercise.