Creating New Column with Conditional Value by ID in R Using data.table Package

Summarize Variables in a data.table using Objects: Two Solutions for Efficient Data Manipulation

Understanding Data Tables in R: A Comprehensive Guide to Speed, Efficiency, and Best Practices

Efficiently Finding the Best Match Between Two Tables

Using Data Tables with Function Application: Workarounds for Passing Columns into Functions

Mastering the `%between%` Function in `data.table`: A Guide to Efficient Data Subseting

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

How to Calculate Mean Scores for Each Group and Class Using Pandas, List Comprehension, and Custom Functions

Aggregating Data Programmatically in data.table: A Comprehensive Guide to Sum, Mean, Max, and Min Operations

Optimizing rmultinomial in a map2 function to data.table