1)/(1 + exp(b_0 + b_1 * hst + b_2 * ccfl + b_3 * log(gn) + b_4 * (dsob/hst) + b_5 * (hstix50 - 4.5))))</code></p><ul><li><p><code>rc [ft ft-1]</code> - crown ratio</p></li>
<li><p><code>hst [ft]</code> - total height of the stem</p></li>
<li><p><code>ccfl [ft2 ft-2]</code> - crown competition factor of large trees</p></li>
<li><p><code>gn [ft2 acre-1]</code> - stand-level basal area</p></li>
<li><p><code>dsob [in]</code> - diameter of the stem, outside bark at breast height</p></li>
<li><p><code>hstix50 [ft