Written for those who are familiar with the basic strategies of analytic epidemiology, Epidemiology: Beyond the Basics takes readers through a more rigorous discussion of key epidemiologic concepts and methods such as study design, measures of association, research assessment, and more. With real-life examples throughout, the book avoids complex statistical formulations and is an invaluable resource for intermediate students and practicing epidemiologists who wish to expand their knowledge of epidemiology and its role in the medical and public health sciences. The Third Edition is a thorough revision that includes: New chapter reviews the basic measures of evaluation of diagnostic/screening tests (sensitivity, specificity, PPV, NPV), but also others not usually discussed in basic epi books (likelihood ratio and ROC curves, AUC). This chapter also discusses newer methods that have been recently proposed to evaluate the predictive power of emerging risk factors (e.g., NRI, IDI). New section on measures used in clinical research (efficacy, NNT). New section in the confounding chapter on mendelian randomization and an expanded section on DAG's.