        <h2 id="section-internal-functions-and-helpers" class="hasAnchor"><a href="#section-internal-functions-and-helpers" class="anchor"></a>Internal functions and helpers</h2>
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          <p><code><a href="approx_deriv.html">approx_deriv()</a></code> </p>
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        <td><p>Alternative method for confidence interval approximations of derivatives</p></td