---
title: "design_pi0"
output: md_document
---

# 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, $\pi_0$, 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.
