Creating a Dataset with Linear Model Information Using R's Dplyr Library.

Understanding the Issue with ifelse in ddply: Summarize Not Working When Doing Max

How to Pass Arguments to ddply Function When Using it Within Another R Function with do.call()

Fixing R's Null vs NA Conundrum: How to Use NULL Correctly in Your Code

Mastering ddply: Powerful Data Manipulation in R with `data.table` Package