multiarm requires a value to be specified for an uninteresting treatment effect, δ0, used in the definition of the least favourable configurations, which in-turn are used to evaluate the power provided by a particular design. Specify your chosen uninteresting treatment effect here. It should be strictly less than the interesting treatment effect, δ1.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.