title: Discriminant diagnostics.
abstract: I discuss diagnostic methods for discriminant analysis. The equivalence with linear regression is noted and regression diagnostics are considered. The leverage is a function of the linear discriminant function and the Mahalanobis distance of the observation from the group mean. The distribution of this distance is approximately chi-square with degrees of freedom equal to the number of variables. Standard tests may be used to examine the normality assumption. Some examples are given.
authors.affiliation: FDA/CBER/OELPS/DBE, Rockville, Maryland 20852, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Lachenbruch
mesh_terms: D000704:Analysis of Variance; D001699:Biometry / Q000379:methods; D001794:Blood Pressure; D016009:Chi-Square Distribution; D016002:Discriminant Analysis; D006801:Humans; D010953:Plasma Volume; D011237:Predictive Value of Tests; D012044:Regression Analysis; D012769:Shock / Q000401:mortality / Q000503:physiopathology / Q000628:therapy; D015996:Survival Rate; D014556:Urine