Case Control Sample Size Calculator. The formulas are extended from one control per case to F controls per case and adjusted for a potential multi-category confounder in unmatched. The Unmatched Case-Control window opens.
This section illistrates how to determine the minimum sample size pair for a matched case-control. Sample size calculations Sample size for a case-control study This utility calculates the sample size required for a case-control study with specified levels of confidence and power and case and control groups of equal size. In the field Number of controls per case.
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.
Dec 13 2019 Figure 1016 Matched Pair Case-Control Study The odds ratio is an indicator of the effect of exposure on the likelihood of becoming ill. The application will show three different sample size estimates according to three different statistical calculations. And Ji X 2020. 44-45 mn1size of sample from population 1 n2size of sample from population 2 P1proportion of exposure in population 1 P2proportion of exposure in population 2 α Significance 005 βchance of not detecting a difference 02 1-β Power 08 r n2n1 ratio of cases.
