**</span></span>
<span><span class="co">#*** Model 1: Single factor model</span></span>
<span><span class="va">lavmodel</span> <span class="op">&lt;-</span> <span class="st">"</span></span>
<span><span class="st">     # omit item C3</span></span>
<span><span class="st">     F=~ A1+A2+A3+A4 + C1+C2+C4 + B1+B2+B3+B4</span></span>
<span><span class="st">     F ~~ 1*F</span></span>
<span><span class="st">            "</span></span>
<span></span>
<span><span class="co"># convert syntax and estimate model</span><