Mastering Data Table and Plyr Parallelization in R: A Step-by-Step Solution

Repeating Observations by Group in data.table: An Efficient Approach

Using the `ddply` Function in R: A Comprehensive Guide to Date Manipulation and Aggregation

Smart Transpose of a Data Frame in R Using Tidyr Library

Understanding Why `unique.default(x)` Fails for Data Frames in R: A Comprehensive Guide

Calculating Percentages from a DataFrame with Multiple Species, Treatments, and Variables using dplyr: A Step-by-Step Guide to Correct Grouping and Percentage Calculation

Creating a New Variable in a Data.Frame Based on Row Values: A More Efficient Approach with data.table Package