ass="va">mirtmodel</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.model.html" class="external-link">mirt.model</a></span><span class="op">(</span> <span class="st">"</span></span>
<span><span class="st">             O=1-6</span></span>
<span><span class="st">             # a(O18)=a(O23), t1(O3)=t1(O18), t2(O3)=t2(O8)</span></span>
<span><span class="st">             CONSTRAIN=(4,5,a1), (1,3,d1), (1,2,d2)<