digital conservancy

Invariance of trait scales across changing samples of items and examinees is a central tenet of item response theory (IRT). However, scales defined by most IRT models are truly invariant with respect to certain linear ...

Multidimensional item response theory (MIRT) computerized adaptive testing, building on recent work by Segall (1996), is applied in a licensing/certification context. An example of a medical licensure test is used to ...

For the measurement of multiple traits, this paper proposes assembling tests based on the targets for the (asymptotic) variance functions of the estimators of each of the traits. A linear programming model is presented ...

A multidimensionality-based differential item functioning (DIF) analysis paradigm is presented that unifies the substantive and statistical DIF analysis approaches by linking both to a theoretically sound and ...

According to the weak local independence approach to defining dimensionality, the fundamental quantities for determining a test’s dimensional structure are the covariances of item-pair responses conditioned on examinee trait ...