Cohort study: exposed vs unexposed cumulative incidence (1:m allocation)

n_exposed = [Z_(a/2) sqrt((1+1/m) pbar(1-pbar)) + Z_b sqrt(p1(1-p1) + p0(1-p0)/m)]^2 / (p1-p0)^2 where pbar = (p1 + m p0)/(1+m) and m is the unexposed:exposed allocation ratio. Anchor: Bhardwaj 2024 p.2559 (p0=0.20, p1=0.30, m=1 -> 293; +10% non-response -> 322/group, total 644).

Usage

calculate_cohort_proportion(p0, p1, ratio, alpha, power, dropout)