Extracting Values from Alternative Columns Using R's Melt Function

Calculating y/y and w/w in a Data Frame: A Deep Dive

Using eval to Dynamically Add Columns to a Contingency Table in R

Rewriting R Code to Avoid Security Vulnerabilities with .==

Improving Efficiency of Phone Number Validation Function in R with Vectorized Operations

Using Multiple Columns from a Function Call with Data.tables in R: A More Efficient Approach

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

Data.table Filtering on Group Size with Value Matching While Considering Multiple Fields and Complex Queries

Filling Values Based on Matched IDs in Data.tables Using R Programming Language

Extracting First Non-NA Value for Each Group and Column in R Data.tables