ershoot by design. Compared to the <code>linexp</code> model, fitting <code>powexp</code> is more reliable and rarely fails to converge in the presence of noise and outliers. The power exponential can be useful with MRI data when there is an unusual late phase in emptying.</li>
</ul>
</div>
<div class="section level3">
<h3 id="methods-with-variants">Methods with variants<a class="anchor" aria-label="anchor" href="#methods-with-variants"></a>
</h3>
<ul>
<li>Population fits based on function <code>nlme</code>