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Episheet is a spreadsheet workbook that evolved from a collection of programs for first-generation programmable calculators (Epidemiologic Analysis with a Programmable Calculator), by Kenneth J. Rothman and John D. Boice, Jr.) It comprises various analyses for epidemiologic data, including confounding control by stratification of rate data, risk data and case-control data, study size and power computation, standardization, analysis of matched case-control data, analysis of seasonal trends, computation of exact confidence limits for selected measures, meta-analysis, and more. The file is free to download and share.