. The core result is a number_of_persons x 2 matrix, which contains the ability estimate and the SE for each submitted person.</p>
    <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

    <p>For a test with both: dichotomous and polytomous items which have been scaled under 1/2/3/4-PL model or the GPCM, use this function to estimate the person ability parameters. You have to define the appropriate model for each item.</p>
<p>Please note, that  <code>robust</code> estima