ing an average in general.</p>
<p>Because the test set size is chosen for convenience in cross-validation, results should be presented on a per-item scale, such as average absolute error or root mean square error, not on the scale of error in the fold being evaluated.</p>
</section>
<section id="user-defined-permutations" class="level3 unnumbered">
<h3 class="unnumbered anchored" data-anchor-id="user-defined-permutations">User-defined permutations</h3>
<p>It is straightforward to declare the variable <code>