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Relevance of Base Rates to the Validity of A Psychological Test of Brain Damage (M.W.-L.T.)

Winwick Hospital, Warrington, Lancs.

ABSTRACT

The results from two predictive studies of the validity of a psychological test of brain damage (M.W.-L.T.) were compared with the number of correct decisions which would be possible solely from the rates from previous experience (base-rates). The results emphasize the superiority of the test over base-rate predictions and so obviate it from the type of criticism put forward by Meehl and Rosen with respect to the reported validity of the majority of diagnostic psychological instruments reported in the literature.