The measurement models employed to score tests have been evolving
over the past century from those that focus on the entire test
(true score theory) to models that focus on individual test items
(item response theory) to models that use small groups of items
(testlets) as the fungible unit from which tests are constructed
and scored (testlet response theory, or TRT). In this book, the
inventors of TRT trace the history of this evolution and explain
the character of modern TRT. Written for researchers and
professionals in statistics, psychometrics, and educational
psychology, the first part offers an accessible introduction to TRT
and its applications. The second part presents a comprehensive,
self-contained discussion of the model couched within a fully
Bayesian framework. Its parameters are estimated using Markov chain
Monte Carlo procedures, and the resulting posterior distributions
of the parameter estimates yield insights into score stability that
were previously unsuspected.
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