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5. Unstratified Cohort Studies with a Dichotomous Disease Outcome [ref: Schlesselman]

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.

What to Calculate:	Fast Forward:	Specify Parameters:
		Incidence of the disease in the non-exposed group:
		Incidence parameter in the exposed group expressed as: Incidence Value:
		Number in the exposed group:
		Ratio of population sizes for the two groups (non-exposed/exposed):
		Power level:
		One-sided alpha level:
	none	Fast Forward Options: # Iterations: Size of Increment: