/span><span class="cn">NULL</span>, prior_par2<span class="op">=</span><span class="cn">NULL</span> <span class="op">)</span></span></code></pre></div>
    </div>

    <div class="section level2">
    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
    <dl><dt>name</dt>
<dd><p>Type of item response function</p></dd>

<dt>par</dt>
<dd><p>Named vector of starting values of item parameters</p></dd>

<dt>est</dt>
<dd><p>Logical vector indicating which parameters sho