Sample Size Determination
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Hypothesis test for Odds Ratio
This utility can be used to calculate required sample size when your objective is to test whether Odds Ratio is significantly different than 1 in a Case-Control Study. (In other words, your objective is to identify statistically significant risk factors.)
Formula used and other details
Confidence Level %
Enter positive number between 0.01 to 99.99
Required
In percentage. Commonly used values are 95, 99 and 90. Should be between 0.01 to 99.99.
Power ( 1 - β)
Enter positive number between 0.01 and 99.99
Required
In Percentage. Should be between 0.01 to 99.99. Common values are 80 % and 90 %
Ratio of controls to Cases
Enter number from 0.01 to 9.00
Required
One sided or two sided
Enter either 1 or 2
Required
One tailed or two tailed hypothesis
Select any two of these three
Odds Ratio
Proportion of cases exposed
Proportion of controls exposed
Sample Size Required =
Sample Size by Other methods =