an class="op">:</span><span class="fl">31</span><span class="op">]</span></span></span>
<span class="r-in"><span><span class="va">model</span> <span class="op">&lt;-</span> <span class="fu">mirt</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/pkg/mirt/man/mirt.html" class="external-link">mirt</a></span><span class="op">(</span><span class="va">data</span>, model <span class="op">=</span> <span class="fl">1</span>, itemtype <span class="op">=</span> <span class="st">'2PL'</span><spa