By Howard Wainer
The dimension versions hired to attain exams were evolving during the last century from those who specialise in the full try (true rating conception) to versions that concentrate on person attempt goods (item reaction conception) to types that use small teams of things (testlets) because the fungible unit from which exams are developed and scored (testlet reaction idea, or TRT). during this ebook, the inventors of TRT hint the heritage of this evolution and clarify the nature of contemporary TRT. Written for researchers and pros in records, psychometrics, and academic psychology, the 1st half bargains an available advent to TRT and its purposes. the second one half offers a entire, self-contained dialogue of the version couched inside an absolutely Bayesian framework. Its parameters are predicted utilizing Markov chain Monte Carlo strategies, and the ensuing posterior distributions of the parameter estimates yield insights into ranking balance that have been formerly unsuspected.
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