eff.arm.infofract {BATSS}

information-fraction based arm efficacy stop

Description

allows stopping an arm for efficacy at a given look when the probability of the corresponding target parameter being greater or smaller (depending on the argument 'alternative' of batss.glm) than delta.eff is greater than a function of the information fraction at that look.

Usage

eff.arm.infofract(posterior, b, n, N, p)

Arguments

posterior

the 'BATSS' ingredient 'posterior' corresponding, in this context, to the (posterior) probability of the target parameter being greater or smaller (depending on the argument 'alternative' of batss.glm) than 'delta.eff'.

b

a tuning parameter (to be defined in eff.arm.control).

n

the 'BATSS' ingredient 'n' corresponding to the vector of number of recruited participants per arm including the control group.

N

the 'BATSS' ingredient '‘N’ corresponding to the maximum (planned) sample size.

p

a tuning parameter (to be defined in eff.arm.control).

Value

eff.arm.infofract returns a logical constant.