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Division of Cancer Prevention/Biometry Research Group

Power Program

Select What to Calculate, then enter the remaining Parameter Values. Optionally, select a parameter to Fast-Forward, and specify number of and increment per iteration. Press the Default button to use the original default parameter values, or the Undo button to clear modifications made to current defaults. Press the Calculate button for results.

6-1. Unmatched Study with an Unequal Number of Cases and Controls [ref: Schlesselman]

What to Calculate:	Fast Forward:	Specify Parameters:
		Prevalence of exposure in the controls:
		Exposure parameter in the diseased cases expressed as: Exposure Value:
		Number of diseased cases:
		Ratio of population sizes for the two groups (controls/cases):
		Power level:
		One-sided alpha level:
	none	Fast Forward Options: # Iterations: Size of Increment: