nce
matrix of estimates derived by <code>fct</code></p></dd>
 <dt>partial</dt>
<dd><p>matrix (or
vector) of partial derivatives of <code>fct</code> with respect to the parameters
<code>par</code></p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
    <p>The delta method (aka propagation of errors is based on Taylor series
approximation - see Seber's book on Estimation of Animal Abundance). It uses
the first deriv