Georg Rasch and Benjamin Wright’s Struggle With the Unidimensional Polytomous Model With Sufficient Statistics

the past hospitalization and its association with suicide attempts and ideation in patients with mdd and comparison with bmd (depressed type) group

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Rasch fit statistics and sample size considerations for polytomous data

BACKGROUND Previous research on educational data has demonstrated that Rasch fit statistics (mean squares and t-statistics) are highly susceptible to sample size variation for dichotomously scored rating data, although little is known about this relationship for polytomous data. These statistics help inform researchers about how well items fit to a unidimensional latent trait, and are an import...

Person parameter estimation in the polytomous Rasch model

An important task in psychometric measurement is to identify the skills of persons, by accounting the difficulty degree of item responses in questionaries. The Item Response Theory (IRT) is the base for a valid measurement of the skills and the Rasch Model a well established probabilistic model, in the implementation of the theory. More recent extensions of the Rasch Model include the Partial C...

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Constraints with a Polytomous Model

A study was conducted to extend the sequential probability ratio testing (SPRT) procedure with the polytomous model under some practical constraints in computerized classification testing (CCT), such as methods to control item exposure rate, and to study the effects of other variables, including item information algorithms, test difficulties, item pool sizes, and widths of the indifference regi...