ting \(b\) and
    \(a\) item parameters. The default is to use 4 M steps.</p></dd>

<dt>convM</dt>
<dd><p>Convergence criterion in M step</p></dd>

<dt>decrease.increments</dt>
<dd><p>Should in the M step the increments
    of \(a\) and \(b\) parameters decrease during iterations?
    The default is <code>FALSE</code>. If there is an increase in deviance
    during estimation, setting <code>decrease.increments</code> to <code>TRUE</code>
    is recommended.</p></dd>

<dt>oldfac</dt>
<dd><p>Factor \(f\) bet