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Further validation of the IDAS: Evidence of Convergent, Discriminant, Criterion, and Incremental Validity
Psychological Assessment
  • David Watson, University of Iowa
  • Michael W O'Hara, University of Iowa
  • Michael Chmielewski, University of Iowa
  • Elizabeth A McDade-Montez, University of Iowa
  • Erin Koffel, University of Iowa
  • Kristin Naragon, University of Iowa
  • Scott Stuart, University of Iowa
Document Type
Peer Reviewed
Publication Date
NLM Title Abbreviation
Psychol Assess
PubMed ID
DOI of Published Version
We explicated the validity of the Inventory of Depression and Anxiety Symptoms (IDAS; Watson et al., 2007) in two samples (306 college students, and 605 psychiatric patients). The IDAS scales showed strong convergent validity in relation to parallel interview-based scores on the Clinician Rating version of the IDAS (IDAS-CR); the mean convergent correlations were .51 and .62 in the student and patient samples, respectively. With the exception of Well-Being, the scales also consistently demonstrated significant discriminant validity. Furthermore, the scales displayed substantial criterion validity in relation to DSM-IV mood and anxiety disorder diagnoses in the patient sample. We identified particularly clear and strong associations between (a) major depression and the IDAS General Depression, Dysphoria and Well-Being scales; (b) panic disorder and IDAS Panic; (c) posttraumatic stress disorder and IDAS Traumatic Intrusions; and (d) social phobia and IDAS Social Anxiety. Finally, in logistic regression analyses, the IDAS scales showed significant incremental validity in predicting several DSM-IV diagnoses when compared against the Beck Depression Inventory-II (Beck, Steer, & Brown, 1996) and Beck Anxiety Inventory (Beck & Steer, 1990).
  • major depression,
  • anxiety disorders,
  • convergent validity,
  • discriminant validity,
  • criterion validity
Granting or Sponsoring Agency
National Institute of Mental Health
Grant Number

This research was supported by National Institute of Mental Health Grant R01-MH068472 awarded to David Watson.

Journal Article Version
Author's Original
Published Article/Book Citation
Psychological Assessment, 20:3 (2008) pp. 248-259. DOI: 10.1037/a0012570
Copyright © American Psychological Association, 2008. This article may not exactly replicate the final version published in the APA journal. It is not the copy of record. Posted by permission.
Citation Information
David Watson, Michael W O'Hara, Michael Chmielewski, Elizabeth A McDade-Montez, et al.. "Further validation of the IDAS: Evidence of Convergent, Discriminant, Criterion, and Incremental Validity" Psychological Assessment Vol. 20 Iss. 3 (2008) p. 248 - 259 ISSN: 1040-3590
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