The Influence Function as an Aid in Outlier Detection in Discriminant Analysis

Norm A. Campbell

Journal of the Royal Statistical Society Series C, 1978, vol. 27, issue 3, 251-258

Abstract: The influence function is used to develop criteria for detecting outliers in discriminant analysis. For Mahalanobis' D2, the influence function is a quadratic function of the deviation of the discriminant score for the perturbed observation from the discriminant score for the mean of the corresponding group. A X2 approximation to the null distribution of the influence function values appears to be suitable for graphical representation.

Date: 1978
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