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1 Professor of Psychology, Institute of Psychiatry, De Crespigny Park, Denmark Hill, London S.E.5
It is argued that the dispute between the Newcastle group of workers and the London school about the classification of depressive illnesses in terms of one or two dimensions is based on a misunderstanding of the issues involved, and the logic of the statistical methods used by them. There are two, not one, problems involved, relating (a) to the unitary or binary nature of depression, and (b) to the categorical or dimensional nature of these illnesses. Factor analysis is relevant to (a), and conclusively favours the binary view; distribution of scores is relevant to (b), and cannot throw any light on the binary-unitary problem. Kendell's compromise solution of a single continuum running from reactive to endogenous depression is shown to be inadequate statistically, and irrelevant psychologically. A general solution to the diagnostic problem of depressive illnesses is presented.
Submitted on July 15, 1969
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