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Pisa : Frequently Answered Criticisms, Ray Adams
Pisa : Frequently Answered Criticisms, Ray Adams
Prof Ray Adams
Studies such as PISA that attempt to compare outcomes across educational systems are expensive and difficult to implement. Further, the results of such studies are routinely criticized by educational commentators - particularly when the results are not consistent with their preconceived ideas about the relative merits and efficiencies of various educational practices and systems. This chapter discusses what is done to ameliorate the threats to the validity of PISA in five areas often targeted by commentators and reviewers as sources of invalidity in international comparisons. The five areas discussed are: (1) sampling - are the samples of students who undertake …
The Mixed-Coefficients Multinomial Logit Model : A Generalized Form Of The Rasch Model, Ray Adams, Margaret Wu
The Mixed-Coefficients Multinomial Logit Model : A Generalized Form Of The Rasch Model, Ray Adams, Margaret Wu
Prof Ray Adams
Since Rasch's introduction of his item response models, there has been a proliferation of extensions and alternatives, each of which has a different name and different matching software package. The proliferation of models has, in some ways, been a hindrance to practitioners. This paper presents a generalised item response model that provides a unifying framework for a large class of Rasch-type models. The advantages of a single framework include mathematical elegance, generality in a single software package, and a facilitation of the development, testing, and comparison of new models. The unified model is a multidimensional item response model, the specification …