Week 10: Relational Data, Strings, Factors, Dates, and Times
Official Topic
Relational data, strings, factors, dates, and times.
Problem Focus
Why is real data difficult even before modeling begins?
Students handle joins, labels, categorical variables, and dates as sources of both insight and error.
In Class
- Join related tables.
- Clean strings.
- Use factors for categorical variables.
- Parse and use dates and times.
AI-Aware Task
Ask an LLM to join two tables. Then check keys, duplicated rows, unmatched rows, and whether the join changes the meaning of the analysis.