Psychometric properties of the wisconsin schizotypy scales in an undergraduate sample: Classical test theory, item response theory, and differential item functioning

Beate P. Winterstein, Terry A. Ackerman, Paul J. Silvia, Thomas R. Kwapil

Research output: Contribution to journalArticlepeer-review

Abstract

The Wisconsin Schizotypy Scales are widely used for assessing schizotypy in nonclinical and clinical samples. However, they were developed using classical test theory (CTT) and have not had their psychometric properties examined with more sophisticated measurement models. The present study employed item response theory (IRT) as well as traditional CTT to examine psychometric properties of four of the schizotypy scales on the item and scale level, using a large sample of undergraduate students (n=6,137). In addition, we investigated differential item functioning (DIF) for sex and ethnicity. The analyses revealed many strengths of the four scales, but some items had low discrimination values and many items had high DIF. The results offer useful guidance for applied users and for future development of these scales.

Original languageEnglish (US)
Pages (from-to)480-490
Number of pages11
JournalJournal of Psychopathology and Behavioral Assessment
Volume33
Issue number4
DOIs
StatePublished - Dec 1 2011
Externally publishedYes

Keywords

  • Classical test theory
  • Differential item Functioning
  • Item response theory
  • Schizotypy
  • Wisconsin Schizotypy Scales

ASJC Scopus subject areas

  • Clinical Psychology

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