of a normal distribution to be used for generating theta values (default is 1).</p></td>
    </tr>
    <tr>
      <th>difficulty.mean</th>
      <td><p>Mean of a normal distribution to be used for generating item difficulty values (default is 0).</p></td>
    </tr>
    <tr>
      <th>difficulty.sd</th>
      <td><p>Standard deviation of a normal distribution to be used for generating item difficulty values (default is 1).</p></td>
    </tr>
    <tr>
      <th>group.size</th>
      <td><p>The number of perso