This study examined the psychometric properties of the Trauma Inventory for Partners of Sex Addicts (TIPSA). Using the Nominal Response Model (NRM), I examined several aspects of item and option functioning including discrimination, empirical category ordering, and information. Category Boundary Discrimination (CBD) parameters were calculated to determine the extent to which respondents distinguished between adjacent categories. Indistinguishable categories were collapsed through recoding. Empirically disordered response categories were also collapsed through recoding. Findings revealed that recoding solved some technical functioning issues in some items, and also revealed items (and perhaps option anchors) that were probably poorly conceived initially. In addition, nuisance or error variance was reduced only marginally by recoding, and the relative standing of respondents on the trait continuum remained largely unchanged. Items in need of modification or removal were identified, and issues of content validity were discussed.
College and Department
David O. McKay School of Education; Educational Inquiry, Measurement, and Evaluation
BYU ScholarsArchive Citation
Stokes, Steven Scott, "An Examination of the Psychometric Properties of the Trauma Inventory for Partners of Sex Addicts (TIPSA)" (2017). Theses and Dissertations. 6500.
Nominal Response Model (NRM), Item Response Theory (IRT), trauma, sex addiction, Category Boundary Discrimination (CBD)