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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.

4. Power Computations for Designing Comparative Poisson Trials with Unequal Group Sizes [ref: Brown & Green]

What to Calculate:	Fast Forward:	Specify Parameters:
		Incidence rate in the control population:
		Expected Incidence Ratio (Delta: Experimental/Control):
		Number in the control popluation:
		Ratio of population sizes for the two groups (experimental/control):
		Duration time for trial:
		Power level:
		One-sided alpha level:
	none	Fast Forward Options: # Iterations: Size of Increment: