Two methods for studying the incremental validity of a Rorschach variable.

Robyn M. Dawes

57 citations0/0 files storedPsychological Assessment

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Psychological Testing and Assessment Schizophrenia research and treatment Psychometric Methodologies and Testing

Abstract

The MMPI can be scored by a clerk. Also, both the number and form level of Rorschach responses can be easily assessed. Other Rorschach variables should be examined for their incremental validity beyond number of responses and form level, or from these variables plus simple MMPI variables. This study applied multiple regression analyses to 2 data sets with reasonable criteria of pathology that were predicted by W. Perry and D. J. Viglione's (1991) Ego Impairment Index considered alone. The index had only slight incremental validity over and above the number of responses and form quality, and even less when the average MMPI elevation and L. R. Goldberg's (1965) formula for predicting psychosis versus neurosis were entered before these Rorschach variables. Another way of assessing incremental validity is through the use of unit weights, that is, adding standardized variables weighted equally rather than optimally. The unit-weighted incremental validity analysis resulted in the same conclusions.

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References

1979The robust beauty of improper linear models in decision making.1974Linear models in decision making.2010Rorschach Comprehensive System 1994House of cards: psychology and psychotherapy built on myth 1963Incremental Validity : a Recommendation 1965Diagnosticians vs. diagnostic signs: The diagnosis of psychosis vs. neurosis from the MMPI.1991The Ego Impairment Index as a Predictor of Outcome in Melancholic Depressed Patients Treated With Tricyclic Antidepressants 1996Codes of Conduct: Behavioral Research into Business Ethics

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