Part 5. summarize() and group_by(), doing things with multiple tables (left_join() etc), reshaping data (i.e. pivot_longer())

Required

• Data Transformation (5.6-5.7) from R for Data Science
• Aggregating data with summarize and map - we will cover map() and rowwise() later, but summarize and mutate with across are described here. You may want to re-visit this when we get to purrr.

Optional

• This column-wise operations vignette will be useful for the next couple classes.

The following resources are optional reading, but quite helpful in your RMarkdown Journey.

• RMarkdown Cheatsheet
• RMarkdown Cookbook
• RMarkdown for Scientists