gories, appropriate
class probabilities in non-existing categories per items can be
practically set to zero by loading an item for all skill classes
on a fixed \(\lambda_x\) parameter of a small number, e.g. <code>-999</code>.</p>
<p>The implementation of the model builds on pieces work of Anton Formann.
See <a href="http://www.antonformann.at/" class="external-link">http://www.antonformann.at/</a> for more information.</p>
    </div>
    <div id="see-also">
    <h2>See also</h2>
    <div class="dont-index"