Lecture 5: Data Analysis and Graphs

Info and Materials

• Date: July 10, 2025
• Topics: Data Analysis and Graphs
• Slides: View Slides
• Code: usethis::use_course("csp-materials/eda")

Learning Objectives

• Identify best graph types (e.g., bar chart vs. histogram) based on variable types (e.g., categorical vs. numeric)
• Interpret what a graph shows about the data
• Practice using ggplot2 and dplyr

Before Class

• Review the Lecture 4 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 10 Exploratory Data Analysis” from “R for Data Science” 2nd Edition
• Cheat sheets and documentation for ggplot2 and dplyr (from previous lectures)
  • ggplot2 Cheat Sheet
  • ggplot2 Official Documentation
  • dplyr Cheat Sheet
  • dplyr Official Documentation