Math 141: Readings for February 4, 2026

Before coming to lecture today, please review:

• MD 1.2

Then, run library(dplyr) followed by these R help commands in your console, and skim the documentation that shows up in the “Help” pane (usually the bottom left of RStudio). Pay the most attention to the “Description”, “Usage”, “Arguments”, “Value”, and “Examples” sections. Usually, the most common or important uses and arguments are mentioned first. Run a few of the provided examples in your own console for each command.

• ?arrange
• ?group_by
• ?summarize
• ?filter
• ?mutate