IRT assumption of local independence. However, a set of measurement models, testlet response theory (TRT), has been … Carlo burn-in chain lengths on the accuracy of estimation of a TRT model’s item and testlet parameters. The following …

This simulation study compared the performance of two multilevel measurement testlet (MMMT) models: Beretvas and Walker … (including testlet length, sample size, and the pattern of the testlet effects) to assess the impact on the estimation of fixed …, testlet item scores violate the assumption of local item independence (LID) underlying item response theory (IRT). Modeling …

's linking procedure. A recent development in IRT has been the introduction of Testlet Response Theory (TRT) models, in which … local dependence among related sets of items is accounted for by the incorporation of "testlet effect" parameters in the …) testlet model. Quadrature points and weights were used to approximate the estimated distribution of the testlet effect …