 a comparison of the two covariance matrices with and without unit <em>i</em> using their determinants.</li>
<li>
<code><a href="reference/rvc.default.html">rvc()</a></code> calculates relative variance change, a measurement of the ratio of estimates of the <em>l</em> th variance component with and without unit <em>i</em>.</li>
<li>
<code><a href="reference/leverage.default.html">leverage()</a></code> calculates leverage, he rate of change in the predicted response with respect to the observed response.</li