Some Contributions to the Measurement of Psychopathology

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Abstract
This paper presents some of the more important results of a factor analysis of the mental state ratings made as part of the United States–United Kingdom Diagnostic Project's cross-national study. The project was organized in order to help account for the large differences between the two countries in the admission rates for schizophrenia and for the affective disorders (see Kramer, 1969, and Zubin, 1969). The major results of the study have been reported by Cooper, Kendell et al. (1969), Gurland et al. (1969), Cooper (1970), and Cooper, Kendell, Gurland et al. (1972).