Common Code

Author

Bill Perry

Every reference topic below pulls its number, title, and description straight from that file’s YAML frontmatter (topic_number:, description:). The number matches the folder it lives in (01_libraries, 02_reading_writing, …) — nothing here is hand-typed.

Topic # Topic Description
01 Common Code 01 — Libraries Every R package used in the course, grouped by purpose, with a one-time install script so you never re-run install.packages() by accident.
018 Common Code 08 — Custom ggplot2 Themes How to use and resuse themes for cleaning up graphs
02 Common Code 02 — Reading and Writing Files Read and write CSV and Excel files, clean names with janitor, and save a tidy copy — the full raw-to-clean pipeline in one script.
03 Common Code 03 — Basic ggplot2 The basics of using ggplot
04 Common Code 04 — Filter and Select how to clean up rows and columns of data
05 Common Code 05 — mutate() how to do math and add columns based on calculations or mutations
06 Common Code 06 — Pivoting Data how to switch from wide to long and long to wide data
07 Common Code 07 — Advanced Plotting More advanced plotting with ggplot
09 Common Code 09 — Descriptive Statistics Descriptive statistics 3 ways
10 Common Code 10 — Two-Sample t-Test How to do T-Tests
11 Common Code 11 — Correlation and Simple Linear Regression How to do a linear regreession in R and interpret the output and test assumptions
12 Common Code 12 — One-Way ANOVA A one way ANOVA in R with assumptions and post F tests
13 Common Code 13 — Joining Data Frames How to join dataframes into a new one
14 Common Code 14 — Dates with lubridate How to work with dates
15 Common Code 15 — Strings and Factors How to arrange and work with factors
16 Common Code 16 — Writing Functions Making functions or your own short commands
17 Common Code 1 7— Iteration with purrr How to redo things over and over
18 Common Code 18 — Quarto Document Basics Markdown programming the easy way
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