Understanding the Issue with Subsetting R Data Frame Results in Mysterious NA Rows

Melting a Pandas DataFrame from Wide to Long Format Twice on the Same Column

Reshaping Long-Form Data with Pandas: A Comparison of Two Methods

Data Pivoting in R: A Comprehensive Guide to Manipulating Data Frames

Stacking Columns by Looking at the First Column Using Pandas' lreshape Function in Python

Reshaping Data from Datastream for Panel Regression Analysis with R

Reshaping Wide Format Data Using R and data.table Package

Reshaping Data to Plot in R using ggplot2