Statistical Power Calculation
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Power ( 1 - β): Case Control Study
This utility can be used to calculate post-hoc satistical power gained with given 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
Sample Size Available in case group
Enter positive number more than 1
Required
Sample size available with you in case group.
Sample Size Available in control group
Enter positive number more than 1
Required
Sample size available with you in control group.
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.
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
Power ( 1 - β) =