Subsetting the First Row of Each Element in a Variable Using Dplyr

Understanding Factor Levels in R: How to Eliminate Unused Levels with droplevels()

Removing Group IDs Based on Condition in At Least One Group Using R Programming Language.

Logical Subset from Matrix Based on Multiple Columns with No Names

Calculate Seasonal Variations Using lubridate and R: A Step-by-Step Guide

Subsetting Nominal Variables in R: A Comparative Analysis of Data.table, dplyr, and Base R