e> have. The <code>delete</code> and <code>approx</code> parameters available for <code><a href="../reference/hlm_influence.default.html">hlm_influence()</a></code> are not available in <code><a href="../reference/hlm_augment.html">hlm_augment()</a></code>, so the function will always use a one step approximation and delete all observations or groups instead of a selected few. The <code>standardize</code> parameter from <code><a href="../reference/hlm_resid.default.html">hlm_resid()</a></code> is also not i