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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.

1. Comparative Clinical Trial with Loss to Follow-up and a Period of Continued Observation [ref: Rubinstein, Gail, & Santner]

What to Calculate:	Fast Forward:	Specify Parameters:
		Control Group Hazard Rate:
		Express Hazard Rate in the experimental group as: Enter Value:
		Number of entrants per time unit (N):
		Control Group Loss Rate:
		Experimental Group Loss Rate:
		Total accrual time (T):
		Length of follow up:
		Power level:
		One-sided alpha level:
	none	Fast Forward Options: # Iterations: Size of Increment: