Tags / plyr
Creating a New Variable in a Data.Frame Based on Row Values: A More Efficient Approach with data.table Package
Repeating Observations by Group in data.table: An Efficient Approach
Data Summarization and Grouping with Dplyr in R: A Comprehensive Guide
How to Fix the Multiple Observer Issue with observeEvent in Shiny Applications
Split Apply Recombine with Plyr and Data.table in R: A Performance Comparison
Smart Transpose of a Data Frame in R Using Tidyr Library