THREE MULTIDIMENSIONAL MODELS FOR TESTLET-BASED TESTS: FORMAL RELATIONS AND AN EMPIRICAL COMPARISON

Three Multidimensional Models for Testlet-Based Tests: Formal Relations and an Empirical Comparison

Testlet-Based Multidimensional Adaptive Testing

Multidimensional adaptive testing (MAT) is a highly efficient method for the simultaneous measurement of several latent traits. Currently, no psychometrically sound approach is available for the use of MAT in testlet-based tests. Testlets are sets of items sharing a common stimulus such as a graph or a text. They are frequently used in large operational testing programs like TOEFL, PISA, PIRLS,...

Polytomous multilevel testlet models for testlet-based assessments with complex sampling designs.

Applications of standard item response theory models assume local independence of items and persons. This paper presents polytomous multilevel testlet models for dual dependence due to item and person clustering in testlet-based assessments with clustered samples. Simulation and survey data were analysed with a multilevel partial credit testlet model. This model was compared with three alternat...

Robust Automated Test Assembly for Testlet-Based Tests: An Illustration with Analytical Reasoning Items

In many high-stakes testing programs, testlets are used to increase efficiency. Since responses to items belonging to the same testlet not only depend on the latent ability but also on correct reading, understanding, and interpretation of the stimulus, the assumption of local independence does not hold. Testlet response theory (TRT) models have been developed to deal with this dependency. For b...

an evaluation and comparison of physical and empirical models for estimation of leaf wetness duration

leaf wetness duration (lwd) is a key parameter in agricultural meteorology. because of difficulties involved in lwd being readily measured, several methods have been developed to estimate it from weather data. among the employed to estimate lwd, those that use physical principles of dew formation plus dew and/or rain evaporation have shown to be especially transmittable and of sufficiently accu...