Calculates the operating characteristics of a two-stage boundary.
oc.twostage.bdry(pu, pa, r1, n1, r, n)
oc.twostage.bdry returns the type I and II error rates as well as the probability of early temination and expected sample size under pu for a specific boundary.
unacceptable response rate
response rate that is desirable
first stage threshold to declare treatment undesirable
first stage sample size
overall threshold to declare treatment undesirable
total sample size