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Open Source Statistics for Public Health | Documentation | Testing | About | Help |
Author(s)
StatisticsKevin M. Sullivan, Emory University
based on code from John C. Pezzullo
Interface
Andrew G. Dean, EpiInformatics.com, and Roger A. Mir
Sample Size:X-Sectional, Cohort, & Randomized Clinical Trials
This module calculates sample size for unmatched cross-sectional and cohort studies, including clinical trials. You enter the desired confidence level, power, ratio of exposed to unexposed samples, and a hypothetical percentage of outcome among the controls. Then enter one of four parameters to be detected, and the others will be calculated.
Results are presented using methods of Kelsey, Fleiss, and Fleiss with a continuity correction.