 listed in the last column correspond to the Stan
program blocks in the first column. The middle column indicates
whether the block allows statements. The last row indicates that
parameter initialization requires a read and transform operation
applied once per chain.</em></p>
<table>
<thead>
<tr class="header">
<th align="left">block</th>
<th align="center">statement</th>
<th align="left">action / period</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td align="left"><code>data</code></td>
<td align="center">