Control arm response rate
=========================

When assuming the outcomes are Bernoulli distributed, **multiarm**
requires a value to be specified for the response rate in the control
arm, *π*<sub>0</sub>, used in the definition of the global null
hypothesis, global alternative hypothesis, and the least favourable
configurations, which are in-turn used to evaluate the operating
characteristics provided by a particular design. Specify your chosen
control arm response rate here. It should be strictly between 0 and 1.
