A Latent Trait Analysis of the MMPI

Abstract

Commonly used techniques for analyzing the structure of the MMPI scales were discussed and the use of a latent trait model was suggested as an alternative. The items on each scale of the MMPI were calibrated using a discrimination statistic. The item calibration statistics obtained from a replication sample were highly correlated with those obtained in the first sample. Poor fitting items were identified, and possible reasons for poor fits were discussed. The scales generally had few poor fits. The poor fitting items were generally those identified by Wiener (1956) as comprising the "subtle" subscales of the test.

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