1. Measuring dispositional optimism in student Veterans: An item response theory analysis
- Author
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Emre Umucu, Fong Chan, Jia Rung Wu, Beatrice Lee, Kanako Iwanaga, Jessica M. Brooks, and Ada Chen
- Subjects
050103 clinical psychology ,Psychometrics ,media_common.quotation_subject ,education ,05 social sciences ,Concurrent validity ,050109 social psychology ,Experimental and Cognitive Psychology ,humanities ,Exploratory factor analysis ,Classical test theory ,Test (assessment) ,Optimism ,Item response theory ,0501 psychology and cognitive sciences ,Psychology ,General Psychology ,Social Sciences (miscellaneous) ,Reliability (statistics) ,media_common ,Clinical psychology - Abstract
Background: The psychometric properties of the Life Orientation Test-Revised (LOT-R) have been established among college students, yet psychometric evidence is lacking for a sample of student Veterans in postsecondary education.Aims: The purpose of this study was to evaluate psychometric properties of the LOT-R for the assessment of dispositional optimism in student Veterans by using classical test theory (CTT) in conjunction with item response theory (IRT).Method: A sample of 205 student Veterans were recruited from universities across the United States. Exploratory factor analysis was conducted to test the unidimensionality of the LOT-R. A polychotomous IRT model using graded response model (GRM) was estimated. Reliability and concurrent validity of the LOT-R were tested.Results: CTT in conjunction with IRT validated that the LOT-R is a psychometrically sound unidimensional instrument for assessing the levels of dispositional optimism in student Veterans. The LOT-R was found to be associated wit...
- Published
- 2018
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