Psychometric Properties of the Wisconsin Schizotypy Scales in an Undergraduate Sample: Classical Test Theory,Item Response Theory,and Differential Item Functioning |
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Authors: | Beate?P?Winterstein Terry?A?Ackerman Paul?J?Silvia Email author" target="_blank">Thomas?R?KwapilEmail author |
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Institution: | (1) Department of Educational Research Methodology, University of North Carolina at Greensboro, Greensboro, NC, USA;(2) Department of Psychology, University of North Carolina at Greensboro, P.O. Box 26170, Greensboro, NC 27402-6170, USA; |
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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. |
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