- Item response theory detected differential item functioning between healthy and ill children in quality-of-life measuresMichelle M Langer
Thurstone Psychometric Laboratory, University of North Carolina, Davie Hall, CB 3270, Chapel Hill, NC 27599 3270, USA
J Clin Epidemiol 61:268-76. 2008..To demonstrate the value of item response theory (IRT) and differential item functioning (DIF) methods in examining a health-related quality-of-life measure in children and adolescents...
- PROMIS Pediatric Anger Scale: an item response theory analysisDebra E Irwin
Department of Epidemiology, CB 7295, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
Qual Life Res 21:697-706. 2012..The objective of the present study was to report on the psychometric properties of the PROMIS Pediatric Anger Scale...
- An item response analysis of the pediatric PROMIS anxiety and depressive symptoms scalesDebra E Irwin
Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
Qual Life Res 19:595-607. 2010..The psychometric properties of the anxiety and depressive symptom item banks are described...
- Practical issues in the application of item response theory: a demonstration using items from the pediatric quality of life inventory (PedsQL) 4.0 generic core scalesCheryl D Hill
RTI Health Solutions, Research Triangle Park, North Carolina 27709 2194, USA
Med Care 45:S39-47. 2007..This article discusses results obtained using categorical confirmatory factor analysis (CCFA) to check IRT model assumptions and the application of IRT in item analysis and scale evaluation...