Computing Percent Change for Each Group in a Pandas DataFrame Using GroupBy and PctChange

Creating Dummy Variables in R: A Step-by-Step Guide for Every Unique Value in a Column Based on a Condition

Merging DataFrames with Matching Values in R: A Step-by-Step Guide

Finding Rows of a Data Frame Where Certain Columns Match Those of Another Using R's Merge Function

Replacing Missing Country Values with the Most Frequent Country in a Group Using dplyr, data.table and Base R

Renaming Objects of Lists with Wildcard Characters in R

Working with Tables in R: Creating a Table by Selecting the First Value and Adding the Others with a Formula

Reshaping Pandas DataFrames from Long to Wide Format with Multiple Status Columns

Adding Date Columns to GroupBy Results Using pandas for Data Analysis.

Creating a New Variable in R Based on Characteristics in Another DataFrame