mathbf{X}_I)^{-1} \mathbf{X}^{T} \),</p></li>
<li><p>\(\mathbf{Q}\) is the analog of \(\mathbf{H}\) defined for the residual matrix \(\mathbf{E}\), that is,
            \(\mathbf{Q} = \mathbf{E} (\mathbf{E}^{T} \mathbf{E})^{-1} \mathbf{E}^{T} \), with corresponding submatrix
            \(\mathbf{Q}_I = \mathbf{E} (\mathbf{E}_I^{T} \mathbf{E}_I)^{-1} \mathbf{E}^{T} \),</p></li>
</ul></div>
    <div class="section level2">
    <h2 id="cook-s-distance">Cook's distance<a class="anchor" aria-label="anchor" href