Week 5 Readings

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

Required

• group_by() Data Transformation (3.5-3.6) from R for Data Science (2e)
  • The 1st edition’s Section 5.6 on Grouped summaries with summarise() is more detailed (wordier) and worth looking at as well.
  • The 1st edition also has Section 5.7 on Grouped mutates (and filters) that I did not see in the 2nd edition. Please let me know if you find this content in the 2nd edition!
• 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 Quarto journey.

• Quarto Cheatsheet
• Quarto Guide
• Quarto Reference
• Chapter 28: Quarto from R for Data Science (2e)