Discrimination of the types of schizophrenia by the Wechsler-Bellevue scale.

Discrimination between matched schizophrenics and normals by the Wechsler-Bellevue scale.

“…As was mentioned in the previous study [6], direct comparison with the work of other investigators is difficult. The primary reason is the fact that other investigators have invariably used Wechsler's weighted scores, whereas this study, for the sake of greater accuracy, has used the raw scores.…”

“…The matched groups of 245 schizophrenics and 237 normals were compared by means of Fisher's discriminant function, an adaptation of the multiple regression technique to the problem of an undistributed dichotomous criterion. The raw scores of the ten subtests were used, plus scores representing education, and intrasubtest scatters [5,6] on eight of the subtests. However, since the prediction on the basis of all nineteen variables was only three per cent better than that on the basis of the ten subtests alone, only the latter part of the study will be reported.…”

“…A LTHOUGH some investigators, notably Rapaport et al [15], have attempted to differentiate among the various subcategories of schizophrenia, as did the previous study of this series [6], the most popular type of analysis has been that of schizophrenics vs. normals. This is natural inasmuch as (1) it is difficult to get very large samples of schizophrenic subgroups, and (2) there is much less diagnostic uncertainty and much more clear-cut differentiation between a hospitalized schizophrenic group and an unhospitalized normal population.…”

“…The use of small samples and relatively inefficient statistical techniques have been cited as two of the possible reasons for these differences. SUBJECTS The schizophrenic sample of 245 cases has been described in the previous paper [6]. With this schizophrenic sample, a group of 237 normal records was matched for age and full scale IQ.…”

Chapter IV: Discriminant Analysis

“…About as many applications of discriminant analysis have been made for the purpose of illustrating the method (20,49,65,96,97,98,103) as for using the method as a research tool with little explanation of it (2,12,22,30,51,58,89,109). For some psychologists and educators the discriminant function is still little more than a superfluous way to compute a multiple regression function for a dichotomous criterion (35,38,67,112). The discriminant function seems to be accepted in its own right in the field of biometrics (9,10,11,16), but to be still in the expository phase in the field of econometrics (101).…”