Getting Unique Value Combinations and Calculating Proportions with R's DataFrames

Data Manipulation and Filtering in R: A Case Study on Multiplying Column Values within a Date Range While Replacing Old Values

Averaging Different Columns in R using split.default and sapply Functions

How to Add Missing Months to a Time Series DataFrame in R Using the tidyr Package

Stacking a Dataset: Relating Each Observation to All Other Observations But Itself

Transforming a Dataset from Rows to Columns in R: A Step-by-Step Guide

Splitting a Large DataFrame into Smaller Ones Based on Column Names Using Regular Expressions in Python

Understanding Implicit Character Conversion in R with Apply: Avoiding Unexpected Results in Data Frame Manipulation

Substituting Values Across Different DataFrames in R Using lapply and Custom Functions

How to Calculate Sums, Standard Deviations, and Averages in R for Subtotals