Before You Watch

This lecture will continue the material on data frame manipulation covered in the last module, introducing advanced methods including group and summarizing, pivoting to wide and long formats, and joining multiple tables. The concept of "piping" is also introduced. This is an advanced technique that allows the programer to build concise blocks of code that combine multiple data processing steps.

Video

Lecture Slides

This lecture covers chapter 3 (sections 3.2-3.5) from the textbook.

https://bookdown.org/mcwimberly/gdswr-book/graphics-with-ggplot2.html

Download these data for the chapter 3 tutorial.

gdswr_chapter3_data.zip

Key Takeaways

Check your understanding with these questions/statements:

What are the differences between long and wide format data, and in what scenarios might each format be more useful?
What are some situations where it is necessary to join two data tables?
What are some practical approaches for summarizing and visualizing missing observations in a dataset?