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Direct linkScheiblechner, Hartmann – Psychometrika, 2007
The (univariate) isotonic psychometric (ISOP) model (Scheiblechner, 1995) is a nonparametric IRT model for dichotomous and polytomous (rating scale) psychological test data. A weak subject independence axiom W1 postulates that the subjects are ordered in the same way except for ties (i.e., similarly or isotonically) by all items of a psychological…
Descriptors: Psychometrics, Intervals, Rating Scales, Psychological Testing
Meijer, Rob R.; Baneke, Joost J. – Psychological Methods, 2004
The authors discuss the applicability of nonparametric item response theory (IRT) models to the construction and psychometric analysis of personality and psychopathology scales, and they contrast these models with parametric IRT models. They describe the fit of nonparametric IRT to the Depression content scale of the Minnesota Multiphasic…
Descriptors: Psychometrics, Psychopathology, Personality Assessment, Nonparametric Statistics
