Chapters Last updated Nov 18, 2020 Save as PDF Acknowledgements 1.1: What is Epidemiology? Page ID38543 ( \newcommand{\kernel}{\mathrm{null}\,}\) 1.1: What is Epidemiology?1.2: Measures of Disease Frequency1.3: Surveillance1.4: Introduction to 2 x 2 Tables, Epidemiologic Study Design, and Measures of Association1.5: Random Error1.6: Bias1.7: Confounding1.8: Effect Modification1.9: Study Designs Revisited1.10: Causality and Causal Thinking in Epidemiology1.11: Screening and Diagnostic Testing