l Checking</a></li><li class="breadcrumb-item"><a href="../stan-users-guide/cross-validation.html">Held-Out Evaluation and Cross-Validation</a></li></ol></nav></header>

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<section id="held-out-evaluation-and-cross-validation" class="level1">
<h1>Held-Out Evaluation and Cross-Validation</h1>
<p>Held-out evaluation involves splitting a data set into two parts, a training 