Splitting Data into Wide and Long Formats in R Using melt Function from data.table Package

Calculating Cumulative Sum with Condition and Reset in R: A Practical Guide

Understanding the Logic Behind Removing NA Values When Filtering Character Vectors in R's data.table Package

Converting Data Between Long and Wide Format in DataTables: Best Practices and Error Resolution Strategies

Recoding Multiple Variables at Once Using the `else=copy` Option in R