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

Using Dplyr to Generate Values Satisfying Multiple Conditions in R

Writing Per-Variable Counts with Data.tables in R: Efficient CSV File Output Using l_ply Function

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

Using do.call to Build and Execute Data.table Commands: A Comprehensive Guide

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

Replacing Traditional for Loops with Recursive Plyr Functions: A Comprehensive Guide

The Great R Package Confusion: Why summarize Doesn't Work with Group By in dplyr

Reshaping Three-Collar Data Frames to Matrix Format Using R