Creating a New Variable in a Data.Frame Based on Row Values: A More Efficient Approach with data.table Package

Using Dplyr to Generate Values Satisfying Multiple Conditions in R

Creating a Single DataFrame by Aggregating Multiple DataFrames in R Using Nested sapply Functions

The Great R Package Confusion: Why summarize Doesn't Work with Group By in dplyr

Reshaping Three-Collar Data Frames to Matrix Format Using R