Calculating Sample Size For A Case Control Study. The calculations are the same as inComparing Proportions for Two Independent Samplessetting p1p0 and p2 p0RR1 p0RR - 1. Select the Two-sided confidence level of 95 from the drop-down list.
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In case control studies we usually calculate the odds ratio if you are also planning to do so your required sample size can be calculated by just putting in the values of Expected proportion. However case-control studies employ a different sampling strategy that gives them greater efficiency. In addition it is well known that collapsing an ordinal variable into two categories is statistically inefficient.
The sample size assumed equal for cases and controls separately is.
Enter a value for desired power default is 80. A case-control design offers an alternative that is much more efficient. The Cohort or Cross-Sectional window opens. A computer program simulating case-control studies is described.
