A4  # set loading of A3 to 1.3</span></span>
<span><span class="st">     B=~ B1+1*B2+b3*B3+B4</span></span>
<span><span class="st">     C=~ c*C1+C2+c*C3+C4</span></span>
<span><span class="st">     A1 | da*t1</span></span>
<span><span class="st">     A3 | da*t1</span></span>
<span><span class="st">     C4 | dg*t1</span></span>
<span><span class="st">     B1 | 0*t1</span></span>
<span><span class="st">     B3 | -1.4*t1   # fix item threshold of B3 to -1.4</span></span>
<span><span class="st">     A ~~ 1*A</s