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Provide a simplified graphical reference for determining required sample sizes when planning retrospective epidemiologic investigations.

A graph of sample sizes for retrospective studies.

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Provide a simplified graphical reference for determining required sample sizes when planning retrospective epidemiologic investigations.
Derived graphical curves mapping mathematical relationships between sample size, effect size, and statistical significance criteria for retrospective designs.
Enables rapid visual estimation of appropriate sample sizes across various design parameters without requiring manual computation.
Supports efficient study design by ensuring adequate statistical precision prior to retrospective data collection.

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Methodological report demonstrates graphical sample size determination in retrospective studies, facilitating efficient epidemiological study design.

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Chase et al. (1965) studied this question.

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Methodological report demonstrates graphical sample size determination in retrospective studies, facilitating efficient epidemiological study design.