Bonus chapter: Chapter 26 on Causal Inferences From Observational Data: Directed Acyclic Graphs and Potential Outcomes (current status: draft; last modified: 2023-03-31).

Answers to odd-numbered exercises for Chapter 26. Answers to all exercises are available to instructors using the text in a college or university course (write to me to obtain the answers).

Blau and Duncan stratification data set: BlauDuncan.txt