ls and deletion of subsets of size
m&amp;gt;1, but they are only included here for experimental purposes."><meta property="og:description" content="These functions implement the general classes of influence measures
for multivariate regression models defined in Barrett and Ling (1992),
Eqn 2.3, 2.4, as shown in their Table 1.
They are defined in terms of the submatrices for a deleted index subset \(I\)
$$H_I = X_I (X^T X)^{-1} X_I$$
$$Q_I = E_I (E^T E)^{-1} E_I$$
corresponding to the hat and residual matric