group_by() and summarize(): Aggregate rows to a summary statistic within subgroups

This video walks you through using summarize() to convert a data frame with many rows to a data frame with a few rows summarized by some statistic (e.g., the median). The video also shows how group_by() can be used to make that summary statistic within subgroup (e.g., among those with and without four-year college degrees).

This video is in a series from Info 3370: Studying Social Inequality with Data Science.
Cornell University (Sp '23)