x_priors</a></code>, the
hyperparameters for normal priors on the six model parameters.</p></td>
    </tr>
    <tr>
      <th>alpha_mean</th>
      <td><p>Optional, the prior normal mean of the intercept term in
the toxicity logit model. A number. You should prioritise specifying this
value via <code>priors</code> but this option is provided for
backwards-compatibility.</p></td>
    </tr>
    <tr>
      <th>alpha_sd</th>
      <td><p>Optional, the prior normal standard deviation of the
intercept term in the