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The interpretations Faris and Dunham have advanced for their data on the ecological distribution of mental disorders are based on the assumption that hospitalized cases are a representative sample of all cases. A study of 275 cases of mental disorder shwos that the various types of psychosis are differentially apparent in different kinds of areas. The factors which make for the selection of cases for mental hospitals are not the same in all local areas of a city.
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Owen et al. (1941) studied this question.
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