Subscale structure for the Positive and Negative Syndrome Scale (PANSS): A proposed solution focused on clinical validity

Mary E. Kelley, Leonard White, Michael T. Compton, Philip D. Harvey

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Although the items of the Positive and Negative Syndrome Scale (PANSS) are ordinal, continuous data methods are consistently used to analyze them. The current study addresses this issue by applying a categorical method and critically examining the ideas of item inclusion and goodness of fit. Data from 1527 subjects were used to test a proposed solution to the factor structure of the PANSS using a categorical factor analytic method. The model was made more generalizable by setting a minimum level of association between the item and the factor, and the results were then compared to existing solutions. The model was also tested for consistency in a first-episode sample. Use of categorical methods indicated similar results to previous analyses; however, it is demonstrated that the strength of the estimates can be unstable when items are shared across factors. The current study demonstrates that solutions can change substantially when a model is over-fitted, and therefore use of measures of fit as the criterion for an acceptable model can mask important relationships and decrease clinical validity.

Original languageEnglish (US)
Pages (from-to)137-142
Number of pages6
JournalPsychiatry Research
Volume205
Issue number1-2
DOIs
StatePublished - Jan 30 2013

Keywords

  • Confirmatory factor analysis (CFA)
  • Latent variables
  • Positive and Negative Syndrome Scale (PANSS)
  • Psychotic symptoms
  • Schizophrenia

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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