Classification of New Cases: Some Aspects of Single and Multivariate Analysis
In the preceding chapters we have discussed the advantages of quantitation, the factors which influence the subjective diagnostic process and the implicit or subconscious presence of a structural model in the qualitative or quantitative analysis of a structure. Chapter 3 and sections A.2.1 and A.2.2 deal with the collection of quantitative data. In the present chapter, some aspects of techniques used for the discrimination of groups of patients on the basis of quantitative data will be discussed. Moreover, the classification of new patients will be considered. In agreement with the aims of this manual, and as we hope, also in accordance with the desire of most of the readers, formulas will be omitted as much as possible. Diagrams will illustrate the purposes of certain techniques. For a more technical, mathematical-oriented approach, reference is made to basic statistical textbooks (Cooley and Lohnes, 1971; Meisel, 1972). Of course, the criteria to define the groups to be investigated should be very clearly defined beforehand, irrespective of the nature of the criteria (morphological, biochemical, prognostic, or other).
KeywordsDecision Tree Discriminant Analysis Decision Rule Linear Discriminant Analysis Receiver Operating Characteristic Curve
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