Claridge and Birchall, different forms of the P scale, and dependable moderators

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Abstract

With respect to the Psychoticism (P) scale in the Eysenck Personality Inventory (EPI), the present author agrees with G. S. Claridge and P. Birchall (see record 1979-26131-001) that because the P scale previously employed by Claridge derives from the Psychoticism-Extraversion-Neuroticism Inventory and is importantly different from the P scale imbedded within the EPI, the findings by Claridge and his colleagues have uncertain relevance for the construct validity of the EPI. The basis for previously expressed concern (see record 1978-28560-001) regarding the analysis of the G. S. Claridge and H. J. Chappa study (see record 1974-02520-001) is clarified and extended, using the moderator variable paradigm. It is concluded that psychoticism, however defined, has not yet been established empirically as a strong and generally replicable moderator of the relation between 2-flash threshold and skin conductance level. (16 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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