Creating New Columns in data.table Using a Variable for Column Names

Selecting Highest Values per Group using R's data.table Package

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

Conditionally Filter Data.tables with Efficient and Readable R Code

Understanding the Performance Difference Between lapply and Hardcoding in data.table: A Performance Comparison Guide

Summing Array Rows in R Based on Conditions Using sapply() Function

Adding Seasonal Dummy Variables to a R Data.table: A Comparative Analysis of Two Approaches

How to Perform Random Sampling of Rows from a Data Table by Group Using data.table in R

Performing Operations on Columns in a data.table Object with Variable Names Using get() Function

Applying Functions to Specific Columns in a data.table: A Powerful Approach to Data Manipulation