Mutating Variables in a data.table by Condition Using Two Variables in Long Format Data

Using Data.table for Efficient Column Summation: A Comparative Analysis of R Code Examples

Optimizing User-Defined Functions in data.table: A Performance-Centric Approach

Concatenating Unique Strings of Variable in Data.table by Repeated Values of Another Variable

Resolving Incorrect Group Values When Plotting in RStudio: A Step-by-Step Guide

How to Pass a List of Columns to data.table's CJ Function as a Vector

How to Calculate New Variable in Unbalanced Panel Data Without Using Loops

Substituting Expressions into the `j` Element in Data.table with `data.table[, j, by]`

Handling Missing Values in R's `t.test()` Function: A Comprehensive Guide

Splitting Columns and Reserving Column Names with R's Data Tables Package