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The British Journal of Psychiatry 151: 355-361 (1987)
© 1987 The Royal College of Psychiatrists

Can categorical and dimensional views of psychiatric illness be distinguished?

DA Grayson
NH&MRC Social Psychiatry Research Unit, Australian National University, Canberra.

Bimodality in a distribution of symptoms is often claimed to be convincing evidence that a disorder is categorical, a discrete disease entity, rather than the extreme on a continuous dimension. However, using concepts from contemporary psychometric theory it is shown that bimodality can arise from the dimensional viewpoint. In fact, contrary to the usual belief, bimodality would be expected to occur in many research contexts if the dimensional alternative were correct.


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Copyright © 1987 The Royal College of Psychiatrists.