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<p>accounted for, results can be erroneously attributed to the phenomenon under study rather than to the method of <a href="page.php?w=sampling_%28statistics%29">sampling</a>.</p>

<p>Medical sources sometimes refer to sampling bias as <b>ascertainment bias</b>. Ascertainment bias has basically the same definition, but is still sometimes classified as a separate type of bias.</p>

<p><big>Distinction from selection bias</big></p>
<p>Sampling bias is usually classified as a subtype of <a href="page.php?w=selection_bias">selection bias</a>, sometimes specifically</p><p>
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