e><a href="reference/dotplot_diag.html">dotplot_diag()</a></code>, which creates dotplots to visually represent influence diagnostics. It is especially useful when used with the values returned by <code><a href="reference/hlm_influence.default.html">hlm_influence()</a></code>. <code>HLMdiag</code> also provides grouped Q-Q plots (<code><a href="reference/HLMdiag-defunct.html">group_qqnorm()</a></code>), and Q-Q plots that combine the functionality of qqnorm and qqline (<code><a href="reference/HLMdiag-defun