L1.9 - Factors and Special Values
Channel: Dr. Lindsay Waldrop
Date: 2021-09-17

Seventh in a series of lectures introducing students to R programming language. In this lecture, these topics are covered: 
- intro to factors (unordered and ordered)
- how to create, subset, and index factors
- special values: infinity, not-a-number, data not available, and NULL. 
- what special values mean and when to use them
- what to do when you encounter special values
Additional materials for this lecture can be found at the course's Github repository: https://github.com/CPSC292-Fall2021/CPSC292-CourseInfo