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The computation of elementary symmetric functions and their derivatives is an integral part of conditional maximum likelihood estimation of item parameters un der the Rasch model. The conditional approach has the advantages of parameter estimates that are consistent (assuming the model is...
Rasch models for partial-credit scoring are discussed and a multidimensional version of the model is formu lated. A model may be specified in which consecutive item responses depend on an underlying latent trait. In the multidimensional partial-credit model, different re sponses may be explained...
Studies investigating the power of person-fit statis tics often assume that the item parameters that are used to calculate the statistics are estimated in a sample with out misfitting item score patterns. However, in practical test applications calibration samples likely will contain such...
Since the 1940s, measurement specialists have called for an empirical validation technique that combines con tent- and construct-related evidence. This study investi gated the value of such a technique. A self-assessment instrument designed to cover four traditional foreign language skills was...
Monte carlo studies are being used in item response theory (IRT) to provide information about how validly these methods can be applied to realistic datasets (e.g., small numbers of examinees and multidimensional data). This paper describes the conditions under which monte carlo studies are...
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