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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.

3. Clinical Trial with Strata-Specific Event Rates and Unequal Group Allocation [ref: Bernstein, Lagakos]

Number of Strata:

What to Calculate:	Fast Forward:	Specify Parameters:
		Number of Entrants per Time Unit:
		Total Accrual Time (T):
		Length of Follow up:
		Hazard Rate for the Controls:
		Hazard Rate Ratio (Delta: control/experimental):
		Proportion of Patients Randomized into the Control Group:
		Power level:
		One-sided alpha level:
	none	Fast Forward Options: # Iterations: Size of Increment: