Lecture 4: Intro to dplyr, Pipes

Info and Materials

• Date: July 8, 2025
• Topics: Wrangling Data with dplyr, Using R Pipes
• Slides: View Slides
• Code: usethis::use_course("csp-materials/dplyr-pipes")

Learning Objectives

• Approach coding tasks as problem-solving by thinking through the steps before writing code
• Understand R logical operators
• Apply key dplyr functions such as filter(), group_by(), and summarize()
• Chain commands using the pipe |> and recognize mistakes to avoid

Before Class

• Review the Lecture 3 materials to get ready for today’s in-class quiz
• Bring your laptop to every class

Readings

Skim the readings before or after class to get the big picture and prep for quizzes and assignments:

• “Chapter 3 Data transformation” from “R for Data Science” 2nd Edition

Additional Resources (not needed for quizzes or homework, but helpful to dive deeper):

• dplyr Cheat Sheet
• dplyr Official Documentation