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

Filtering Data.table on Multiple Criteria in the Same Column Using Various Methods in R

Efficiently Calculating New Data.table Columns by Row Values in R

Using Name Full Name and Maiden Name Strings (and Birthdays) to Match Individuals Across Time

Zone Allocation Problem: A Practical Approach Using R's allocate Function

Overcoming Binary Operator Errors in Subsetted Data.tables: 4 Alternative Solutions

Improving String Splitting Performance in R: A Comparison of Base R and data.table Implementations

Merging Multiple Numeric Columns as a List-Typed Column in Data.Table [R]

Finding Duplicates after Cutoff Row with data.table

Merging Rows in a data.table: A Step-by-Step Guide for Efficient Data Analysis in R