Week 5: dplyr: rowwise, across, and case_when

DATA 412/612 · September 30

Lectures

• 5.1 dplyr: rowwise() and across()(PDF)
• 5.2 dplyr: case_when() and Distinct Rows(PDF)

Labs

• Lab 5: dplyr, Part 2(PDF)
• Lab 5 solutions (password)

Practice

• Flights Related Questions(.qmd)
• Dplyr Practice: 10 Exercises with Solutions(.qmd)

Additional readings

• dplyr: rowwise()
• dplyr: Column-wise operations with across()
• dplyr: case_when()
• Tidyverse Style Guide: Functions

Discussion

• When is case_when() clearer than nested if_else()?
• When would rowwise() be the wrong tool, and what would you use instead?