UNSPECIFIED (2002) A class of logistic-type discriminant functions. BIOMETRIKA, 89 (1). pp. 1-22. ISSN 0006-3444

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Abstract

In two-group discriminant analysis, the Neyman-Pearson Lemma establishes that the ROC, receiver operating characteristic, curve for an arbitrary linear function is everywhere below the ROC curve for the true likelihood ratio. The weighted area between these two curves can be used as a risk function for finding good discriminant functions. The weight function corresponds to the objective of the analysis, for example to minimise the expected cost of misclassification, or to maximise the area under the ROC. The resulting discriminant functions can be estimated by iteratively reweighted logistic regression. We investigate some asymptotic properties in the 'near-logistic' setting, where we assume the covariates have been chosen such that a linear function gives a reasonable, but not necessarily exact, approximation to the true log likelihood ratio. Some examples are discussed, including a study of medical diagnosis in breast cytology.

Item Type:	Journal Article
Subjects:	Q Science > QH Natural history > QH301 Biology Q Science > QA Mathematics
Journal or Publication Title:	BIOMETRIKA
Publisher:	BIOMETRIKA TRUST
ISSN:	0006-3444
Date:	March 2002
Volume:	89
Number:	1
Number of Pages:	22
Page Range:	pp. 1-22
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/11116

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