 </tr>
    <tr>
      <th>W</th>
      <td><p>A treatment vector (1 x n) with numerical values indicating
treatment groups</p></td>
    </tr>
    <tr>
      <th>X</th>
      <td><p>A covariate matrix (p x n) with no intercept. When
<code>GPSM="existing"</code>, then <code>X</code> must be a vector (1 x n) of
user-specified propensity scores.</p></td>
    </tr>
    <tr>
      <th>Trimming</th>
      <td><p>An indicator of whether trimming the sample to ensure overlap</p></td>
    </tr>
    <tr>
      <th>GPS