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

GGPlot2 Subset Parameter in Layers Breaks with Version 2.0.0: Alternative Solutions and Workarounds

Using do.call to Build and Execute Data.table Commands: A Comprehensive Guide

Using Dplyr to Generate Values Satisfying Multiple Conditions in R

Merging Two Dataframes with Unequal Numbers of Rows Using R's merge Function

Selecting Certain Observations Plus Before and After Dates Using R

Summarizing Data with plyr: A Step-by-Step Guide to Data Summarization in R