Dplyr and Multiple Data Frames
Lecture 6
Dr. Elijah Meyer
Duke University
STA 199 - Summer 2023
2022-09-14
Checklist
– Clone ae-05
– HW-2 Due Tuesday (19th) on Gradescope
– Lab-1 Due tonight on Gradescope
– Reminder: Commit and push AEs at end of class
– Keep up with Slack
– Are you still in the GitHub organization?
Announcements: Correct Project
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Announcements: Merge Conflicts
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Announcements: Merge Conflicts
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Announcements: Merge Conflicts (in Groups)
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Goals for today
– Continue practicing with dplyr functions
– Join datasets
Warm up
Identify which dplyr functions chooses rows or changes columns of an existing data set. Also, define what each function does.
– select()
– slice()
– arrange()
Warm up
– select() - column
– slice()
– arrange()
Warm up
– select() - column
– slice() - row
– arrange()
Warm up
– select() - column
– slice() - row
– arrange() - row
Joining datasets
Data merging is the process of combining two or more data sets into a single data set. Most often, this process is necessary when you have raw data stored in multiple files, worksheets, or data tables, that you want to analyze together.
