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Ordinal Item Response Theory Richard Ignace especially for those who mightMeasurement in the social sciences often refers to standardized answers to close ended questions, in which answers are analyzed as if they were measurements on an interval scale. This volume presents a measurement model that maintains the ordinal aspects of the data in order to establish how well the model fits and how it measures subjects and items. It relaxes the most stringent assumptions from parametric item response theory, while maintaining its