Astin Bulletin, 26</em>, 233-245.</p>
<p>Sun, J., Chen, Y., Liu, J., Ying, Z., &amp; Xin, T. (2016).
Latent variable selection for multidimensional item response theory models
via \(L_1\) regularization. <em>Psychometrika, 81</em>(4), 921-939.</p>
<p>Xu, X., &amp; von Davier, M. (2008). <em>Fitting the structured general diagnostic
model to NAEP data</em>. ETS Research Report ETS RR-08-27. Princeton, ETS.</p>
    </div>
    <div id="note">
    <h2>Note</h2>
    <p>If some items have differing number of cate