difference (SMD) are available in <a href="https://www.tandfonline.com/doi/abs/10.1080/00031305.1986.10475403" class="external-link">Flury <em>et al</em> 1986</a> for the univariate case and the multivariate case (essentially the square root of the Mahalanobis distance). Extension to binary variables is discussed in <a href="https://www.tandfonline.com/doi/abs/10.1080/03610910902859574" class="external-link">Austin 2009</a> and extension to multinomival variables is suggested in <a href="https://support.sas