JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Statistics Based on Ranks - Somers D: d(X|Y), d(Y|X) Somers' D is an asymmetric measure of association related to tb (see Siegel & Castellan, 1988, p. 303-310). Copyright © 1995-2020 TIBCO Software Inc. All rights reserved.