Understanding the Problem: Ordering Levels of Multiple Variables in R

Mastering Data Analysis with dplyr in R: A Step-by-Step Guide to Unlocking Your Dataset's Potential

Understanding the Behavior of scale_color_discrete(drop = TRUE) in ggplot2: A Guide to Troubleshooting Missing Values

Understanding ggplot2: Plotting Only One Level of a Factor with Facet Wrap

How to Merge Two Data Frames with a Common Variable in R Using dplyr and merge Functions