
regresions. If Z is not <code>NULL</code>, the linear effects of
covariates are removed from y first, and the resulting residuals
are used in place of y.</p></dd>
<dt>center</dt>
<dd><p>If <code>center = TRUE</code>, center X, y and Z.</p></dd>
<dt>scale</dt>
<dd><p>If <code>scale = TRUE</code>, scale X, y and Z.</p></dd>
<dt>return_residuals</dt>
<dd><p>Whether or not to output the residuals if Z
is not <code>NULL</code>.</p></dd>
</dl></div>
    <div id="value">
    <h2>Value</h2>
    <p>A list with two 