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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>in</code> - how many of the regressors to include (either in canonical
 order, or in the current reordered state)</dd>
<dt><span class="strong">Returns:</span></dt><dd>an array with the partial correlations of the remainder of
 regressors with each other and the regressand, in lower triangular form</dd></dl>
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<h4>getDiagonalOfHat