title: The structure of variation in affect among depressed and nondepressed elders.
abstract: The intraindividual variability of self-ratings of 10 affects was studied in 69 older residents of a long-term care facility. Each person rated his or her affective state over 30 days. P-technique factor analysis was applied to each subject's ratings. In general, the expected two-factor structure showing one positive and one negative factor emerged from both traditional R-analysis and from "chain P-analysis" (all subjects' ratings pooled after standardizing within subjects). Because many subjects gave invariant ratings on one or more affect terms, only 28 P-analyses could be performed, of which 12 yielded one-factor solutions, 16 yielded two-factor solutions (10 the expected two factors), and 5 failed to converge. Possible reasons for the only partial intraindividual replication of the interindividual factors are discussed.
authors.affiliation: Polisher Research Institute, Philadelphia Geriatric Center.
authors.forename: M H
authors.initials: MH
authors.lastname: Kleban
authors.forename: M P
authors.initials: MP
authors.lastname: Lawton
authors.forename: J R
authors.initials: JR
authors.lastname: Nesselroade
authors.forename: P
authors.initials: P
authors.lastname: Parmelee
mesh_terms: D000339:Affect; D000368:Aged / Q000523:psychology*; D000369:Aged, 80 and over; D003863:Depression / Q000523:psychology; D003866:Depressive Disorder / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male