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R. A. Fisher's canonical analysis of contingency tables is shown to be applicable to incidence data as well as to contingency tables, and is accordingly designated by another author's name “correspondence analysis”. In a theoretical section, the method is shown to be equivalent to a special case of Hotelling's canonical correlation analysis and also to a scale‐free variant of principal components analysis. A practical example is examined, and a number of practical considerations discussed.
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M. O. Hill (1974) studied this question.
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