Matching Against Only a Subset of Dataframe Elements Using dplyr: Replicating the "Match" Column

Understanding and Handling Missing Data Values in R DataFrames: Effective Strategies for Analysts

Using Dplyr to Generate Values Satisfying Multiple Conditions in R

Indexing Customer Transactions in R: A Comparative Analysis of Four Methods

Indexing Matrices Using Row and Column Indices with DataFrames in R