the number of active
arms with in order to get the block size per period (block size =
<code>period_blocks</code> <span class="math inline">\(\cdot\)</span>
#active arms)</li>
<li><code>mu0</code> - response in the control arm. Default=0</li>
<li><code>theta</code> - vector with treatment effects for each
treatment arm (of length <code>num_arms</code>)</li>
<li><code>lambda</code> - vector with strength of time trend in each arm
(of length <code>num_arms+1</code>, as time trend in the control is als