The first task of epidemiology is to understand in some depth the concepts of prevalence and incidence, how to quantify them, and key types of error that can affect the measurements of each. In Chapter 1, the author describes prevalence and incidence in single samples (a single population), as well as how to quantify these measures. The chapter will focus on the survival curve as the central measure of incidence of disease over time in a population and then describe how simpler measures such as the incidence proportion (that is, the risk), incidence rate, incidence odds, and measures of time can be derived from the survival curve.
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