Iconoclast08
Critical Thinker
- Joined
- Aug 13, 2008
- Messages
- 318
Sorry to derail, but...
Bpesta22, you are the MAN (or WOMAN) in helping me defend personality tests (or are they astrology charts
), but I'm gonna have to go ahead and disagree with you on the bolded statement above (see Parker, Hanson, & Hunsley, 1988; Jackson et al., 1997; I can give full references if you want them, just let me know).
For the WAIS, based on 26 studies with a total of 3,441 participants, the estimated average validity was 0.62. For the MMPI, based on 30 studies with a total of 4,980 participants, it was 0.46. And for the dreaded (dun dun DUNNN) Rorschach, it was 0.41 (granted, based on 5 studies with 283 participants, but still). In short, it has been found here and in other studies as well that the MMPI and Rorschach are actually more similar than most clinicians are willing to admit on psychometric grounds of reliability and convergent validity (not to mention the Rorschach is actually more stable).
These often cited, classic results always struck me as funny given how clinicians dog the Rorschach but put the MMPI on such a high pedestal of "standardized psychological assessment".
Furthermore, Cronbach alphas of MMPI-2 content scales drop rather precipitously when parceling out response style variance (interferes with construct validity).
Makers of the MMPI (which is probably the best test ever designed) once included a homosexuality scale-- the intent was to diagnose whether the test taker was gay.
Bpesta22, you are the MAN (or WOMAN) in helping me defend personality tests (or are they astrology charts
For the WAIS, based on 26 studies with a total of 3,441 participants, the estimated average validity was 0.62. For the MMPI, based on 30 studies with a total of 4,980 participants, it was 0.46. And for the dreaded (dun dun DUNNN) Rorschach, it was 0.41 (granted, based on 5 studies with 283 participants, but still). In short, it has been found here and in other studies as well that the MMPI and Rorschach are actually more similar than most clinicians are willing to admit on psychometric grounds of reliability and convergent validity (not to mention the Rorschach is actually more stable).
These often cited, classic results always struck me as funny given how clinicians dog the Rorschach but put the MMPI on such a high pedestal of "standardized psychological assessment".
Furthermore, Cronbach alphas of MMPI-2 content scales drop rather precipitously when parceling out response style variance (interferes with construct validity).