>a square matrix, the current value of Z</p></td>
    </tr>
    <tr>
      <th>Y</th>
      <td><p>square matrix of ranked nomination data</p></td>
    </tr>
    <tr>
      <th>YL</th>
      <td><p>list of ranked individuals, from least to most preferred in each
row</p></td>
    </tr>
    <tr>
      <th>a</th>
      <td><p>current value of row effects</p></td>
    </tr>
    <tr>
      <th>b</th>
      <td><p>current value of column effects</p></td>
    </tr>
    <tr>
      <th>Sab</th>
      <td><p>current 