My daughter is starting college this week. We bought her a Mac Book Air. This page is dedicated to first-year college students.
Starting college (or graduate school) means doing a lot of homework, writing papers, citing your sources, and conducting calculations or technical analyses.
In Part 1 we introduced directed acyclic graphs (DAGs)  as a better way to represent program theory . A DAG is a Bayesian network where each directed arrow represents a causal link, not merely a probabilistic dependency .
Several years ago I (TJA) developed the ‘epitools’ R package for epidemiologic data and graphics. My goal was to have a practical package for practicing epidemiologists at local and state health departments.