The problem of structural indeterminacy in multidimensional symptom reportinstruments. The case of SCL-90-R

The factor structure of SCL-90-R items and scales was analyzed using both e xploratory factor analysis (EFA) and confirmatory factor analysis (CFA). Re sults of CFA studies at the item-level failed to support the original nine- factor model, as well as several alternative models and EFA suggested very different dimensionality, depending on which criteria were used. Analyses a t the scale-level (i.e. the nine original symptom dimensions) suggested tha t a one- or two-factor model was satisfactory according to descriptive good ness of fit criteria. However, using the likelihood ratio test, specificati on of four factors was necessary to avoid rejection. According to the likel ihood ratio test in a multi-group analysis, a lack of factorial invariance across gender was indicated. Moreover, the factorial structure of the instr ument was clearly different across levels of negative affectivity (NA); the dimensionality was substantially higher in the low-NA group as compared to the high-NA group. It is concluded that we are confronted with a profound structural indeterminacy problem and that factor analytic methods and model acceptance criteria alone are insufficient to solve this problem. The inde terminacy problem can be accounted for, at least in part, by the complex lo gical-semantical structure of SCL-90-R items and scales and the role of the NA trait as a structure generating factor. (C) 1999 Elsevier Science Ltd. All rights reserved.