¹ For differences between these methods other than those presented in this discussion, see Ladd, George W., “Linear Probability and Discriminant Functions,” Econometrica, 34 (October, 1966), 873–885 CrossRefGoogle Scholar.

² See Fisher, R. A., “The Use of Multiple Measurements in Taxonomic Problems,” Annals of Eugenics, 7 (1936), 179–188 CrossRefGoogle Scholar. Gerhard Tintner obtains the same normal equations as given by Fisher by maximizing A ² – λ(Q – K), where λ is a Lagrange multiplier and K is a constant; see his Econometrics (New York: John Wiley & Sons, Inc., 1952), pp. 96–102 Google ScholarPubMed. The notations used by Fisher and Tintner, respectively, have been modified in this presentation.