lass='op'>=</span><span class='va'>model2est</span><span class='op'>)</span>
</div><div class='output co'>#&gt; Estimating: mixed  4PL, GPCM ... 
#&gt; type = robust </div><div class='output co'>#&gt; <span class='warning'>Warning: Robust estimation for GPCM is still very experimental! </span></div><div class='output co'>#&gt; Estimation finished!</div><div class='input'>

<span class='co'># summary to summarize the results</span>
<span class='fu'><a href='https://rdrr.io/r/base/summary.html'>summary</a></s