Abstract In order to detect a wide range of aberrant behaviors, it can be useful incorporate information beyond the dichotomous item scores. this paper, we extend and person‐fit statistics so that unusual behavior in scores distractors used as indicators aberrance. Through detailed simulations, show new are more powerful than existing detecting several types behavior, they able control Type I e...

few studies use modern approaches to develop a quality of life (qol) questionnaire with acceptable construct validity, especially in iran. our main objective was to construct a new validated and uni-dimensional questionnaire, based on whoqol-100, using the rasch analysis.in a population-based, cross-sectional study in 2007, 500 tehran residents aged≥18 were randomly sampled. the persian version...

In this article, statistical properties of the root mean square deviation (RMSD) item fit statistic in response models are studied. It is shown that RMSD estimates will indicate even misfit for items whose parametric assumption function correct (i.e., fitting items) if some functions test misspecified. Moreover, it demonstrated values misfitting and depend on proportion items. We propose three ...