Education 231C

Applied Categorical & Nonnormal Data Analysis

Discriminant Function Analysis

In the days before the development of multinomial logistic regression many researchers used discriminant function analysis to investigate categorical response variables. Stata does not have a discriminant analysis command built-in so we will use the daoneway command from ATS. The daoneway command is still in development so it doesn't have classifications built into it so we will also include some SPSS output for the second example.

It would be well to keep in mind that discriminant analysis has as an assumption that that the predictor variables have a multivariate normal distribution. For discriminant analysis you can use standard multivariate analysis refrences, such as, Morrison (Multivariate Statistical Methods, 1990) or Affifi & Clark (Computer-aided Multivariate Analysis,1996).

Example 1

Example 2 Example 3

Categorical Data Analysis Course

Phil Ender