Psychiatric and psychological ratings of psychopathology
were compared by means of canonical
correlation of scores on the Inpatient Multidimensional
Psychiatric Scale (IMPS) syndromes with
scores on the 10 subtests of the Structured Clinical
Interview (SCI). The ratings by a team of psychologists
on the SCI and by a team of psychiatrists on
the IMPS were made simultaneously, while one of
the psychologists conducted the structured interview
of the SCI. In this way, 72 acute schizophrenics
were rated shortly after admission to a psychiatric
hospital; 58 of them were re-rated approximately
one month later in a replication of the original
procedure. Two canonical analyses were carried
out: one on the initial ratings, the second on the
replication. Canonical correlations of .84 and .86
were obtained respectively for the first latent roots
at each occasion. Successive significant roots
yielded correlations of .78 and .68 on the initial ratings
and .76, .69, and .64 on the follow-up ratings.
After all 10 latent roots had been extracted for
each occasion of rating, redundancy coefficients
were calculated for each instrument. The results
showed that for the initial ratings 30% of each instrument’s
variance could be explained by the other
instrument; at the follow-up ratings the redundancies
were 40% for both sets of variables. The
data are interpreted as evidence for the congruent
validity of the SCI.
Burdock, Eugene I & et al. (1978). A comparison of psychiatric and psychological assessments of acute schizophrenics. Applied Psychological Measurement, 2, 175-187. doi:10.1177/014662167800200202
Burdock, Eugene I.; Hardesty, Anne S.; Frosch, William A.; Gershon, Samuel; Greco, Philip.
A comparison of psychiatric and psychological assessments of acute schizophrenics.
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