Here's the complete code with all methods:

Converting Year and Month Strings into Full-Fledged Date Objects in R and Python

Reshaping Data from Long to Wide Format in R: A Comprehensive Guide

Reshaping Data from Long to Wide Format in R: A Comprehensive Guide

Resolving the Contrasts Error: A Step-by-Step Guide for Linear Models in R

Splitting Comma-Separated Strings in R: A Comparative Analysis of Four Methods

Understanding the Power of ggplot2 Bar Graphs: Customizing and Ordering for Clear Insights

Troubleshooting Error: Could Not Find Function ... in R: A Step-by-Step Guide to Resolving Common Issues

Using XLConnect to Directly Read and Write Excel Files in R

Indexing Matrices Using Row and Column Indices with DataFrames in R