nd-level basal area</p></li>
<li><p><code>dsob [in]</code> - diameter of the stem, outside bark at breast height</p></li>
</ul><p><b>Model Parameters</b></p><div class="sourceCode"><pre><code>  family       genus       species        b_0      b_2    b_3   b_4
1 Cupressaceae Calocedrus  decurrens     4.40 -0.00267 -0.845  1.09
2 Fagaceae     Chrysolepis chrysophylla  1.66 -0.00241 -0.355  1.25</code></pre></div><p></p><hr><code>rc = 1 - ((1)/(1 + exp(b_0 + b_2 * ccfl)))</code><ul><li><p><code>rc [ft ft-1]</c