ion
<code>multilevelGPSStratification</code>)</p></td>
    </tr>
    <tr>
      <th>GPSM</th>
      <td><p>An indicator of the methods used for estimating GPS, options
include "multinomiallogisticReg", "ordinallogisticReg", and "existing"</p></td>
    </tr>
    <tr>
      <th>linearp</th>
      <td><p>An indicator of subclassification on GPS (=0) or linear
predictor of GPS (=1): (only required in the function
<code>multilevelGPSStratification</code>)</p></td>
    </tr>
    <tr>
      <th>nboot</th>
      <t