Content source: Epi Info™, Division of Health Informatics & Surveillance (DHIS), Center for Surveillance, Epidemiology & Laboratory Services (CSELS) You enter the desired confidence level, power, a hypothetical percentage of exposure among the controls, and either an odds ratio or a hypothetical percentage of exposure among the cases.
If you select the Sample Size and Power tool, the following options appear: Population Survey, Cohort or Cross-Sectional, Unmatched Case-Control. A finite population correction will be applied if the population size is not large. Sample sizes are provided for confidence levels from 90% to 99.99%.
OpenEpi provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched pair and person-time analysis, sample size and power calculations, random numbers, sensitivity, specificity and other evaluation statistics, R x C tables, chi-square for dose-response, and links to other useful sites. Enter data for each calculation type. This module calculates sample size for unmatched cross-sectional and cohort studies, including clinical trials. Navigate each StatCalc tool using the tab or return key to move through the different cells available for data entry. For samples that are not random or … This module calculates sample size for an unmatched case-control study. Page last reviewed: December 13, 2019. The website OpenEpi.com is an open-source web tool that provides additional epidemiologic statistics not included in StatCalc. Visual Dashboard. You enter the desired confidence level, power, ratio of exposed to unexposed samples, and a hypothetical percentage of outcome among the controls…
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