## Recently Published

##### Interactions for Continuous Variables via Multiple Regression with R

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

##### General Approaches with Computerized Adaptive Testing

Models for nominal/ordinal item level data.

##### Factorial Repeated Measures ANOVA

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

##### Playing with coordinates in ggplot2.

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.

##### Tranformations in ggplot2

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

##### Highcharts.js via rCharts

Relationship between Smoking and Exercise.