By Howard Wainer
The dimension types hired to attain assessments were evolving over the last century from those who specialize in the total attempt (true rating thought) to types that concentrate on person try out goods (item reaction idea) to versions that use small teams of things (testlets) because the fungible unit from which checks are built and scored (testlet reaction concept, or TRT). during this publication, the inventors of TRT hint the heritage of this evolution and clarify the nature of contemporary TRT. Written for researchers and pros in statistics, psychometrics, and academic psychology, the 1st half deals an available advent to TRT and its functions. the second one half offers a accomplished, self-contained dialogue of the version couched inside of a completely Bayesian framework. Its parameters are envisioned utilizing Markov chain Monte Carlo systems, and the ensuing posterior distributions of the parameter estimates yield insights into ranking balance that have been formerly unsuspected.