Sample Size Webulator - Sample Size Estimates for A Case Control Study


A Case Control Sample Size Webulator

This Webulator is based on the following sample size formula for a case control study.

The [Zalpha ] and [Zbeta] terms use the “common statistical terms” which are 1.96 to represent the Zalpha term and 0.84 to represent the one tailed Zbeta term. Simply substitute these values into the equation, or into the webulator to compute the number of subjects required in each group for a case-control study.

Only enter the numeric values into the green boxes and click the button labelled "calculate" to compute the sample size. Do not enter any special characters into the Webulator. The sample size refers to the sample size required to represent the number of subjects for each group in a case control study.

p1 = the proportion of
exposure among
p0 = the proportion of
exposure among
Z1-alpha/2 Z1-beta
Sample Size Score is: The Numerator value is: The Denominator value is:

Click here to return to the Webulator Menu Page
For more information, please contact:

Professor William J. Montelpare, Ph.D.,
Margaret and Wallace McCain Chair in Human Development and Health,
Department of Applied Human Sciences, Faculty of Science,
Health Sciences Building, University of Prince Edward Island,
550 Charlottetown, PE, Canada, C1A 4P3
(o) 902 620 5186

Visiting Professor, School of Healthcare, University of Leeds,
Leeds, UK, LS2 9JT
Copyright © 2002--ongoing [University of Prince Edward Island]. All rights reserved.