AR Center; original link is
available at
<a href="https://web.archive.org/web/20221128003829/https://old.bear.berkeley.edu/page/materials-explanatory-item-response-models">https://web.archive.org/web/20221128003829/https://old.bear.berkeley.edu/page/materials-explanatory-item-response-models</a>,
but the data are no longer accessible there.
</p>


<h3>References</h3>

<p>De Boeck and Wilson (2004), <em>Explanatory Item
Response Models</em>, Springer.
</p>


<h3>Examples</h3>

<pre><code class='language-R'>s