 for delta parameters \(\delta\)
parameterizing the latent class distribution by log-linear smoothing
(Xu &amp; von Davier, 2008)</p></dd>

  <dt>delta.init</dt>
<dd><p>Initial \(\delta\) parameters</p></dd>

  <dt>delta.fixed</dt>
<dd><p>Fixed \(\delta\) parameters. This must be a matrix with three columns:
1st column: Parameter index, 2nd column: Group index, 3rd column: Fixed value</p></dd>

<dt>delta.linkfct</dt>
<dd><p>Link function for skill space reduction.
    This can be the log-linear link (<code>