6 Study design in practice
Section 1.3 described the basic designs and Section 4.6 what a case-control odds ratio estimates. This section turns to the decisions that make a cohort or case-control study valid and efficient: where the subjects come from, how controls are chosen and how many, when to match, and how large the study must be.
6.1 Cohort studies
6.2 Case-control studies
6.3 Matching
6.4 Sample size for comparing two groups
6.5 Sample size for comparing rates
6.6 Power, precision and the size of the effect
6.7 Problems
6.2 Case-control studies
6.3 Matching
6.4 Sample size for comparing two groups
6.5 Sample size for comparing rates
6.6 Power, precision and the size of the effect
6.7 Problems
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