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

Using the .() Notation to Simplify dlply Syntax with Multiple Grouping Variables in R

Creating a Nested Table using dplyr and ddply: A Simpler Approach Using prop.table

Creating Wide-to-Long DataFrames in R Using Vectorized Operations

Understanding the Behavior of ddply in R: A Guide to Avoiding Confusion and Achieving Consistency

Understanding the Plyr Error: A Deep Dive into R Packages and Version Confusion