This Monte Carlo study assessed Type I error in differential item functioning analyses using Lord’s chi-square (LC), Likelihood Ratio Test (LRT), and Mantel-Haenszel (MH) procedure. Two research interests were investigated: response theory (IRT) model specification LC the LRT continuity correction MH enhances literature by investigating correct incorrect model-data fit comparing those results t...

The R package equate (Albano, 2010) contains functions for non-IRT equating under random groups and nonequivalent groups designs. This package vignette introduces these designs and provides an overview of statistical equating with details about each of the supported equating methods. Examples demonstrate the basic functionality of the package.

In this note we describe several of the IRT modeling features implemented in Mplus, namely the the item characteristic curves, the item information curves, the total information curve, item difficulty parameter and item discrimination parameter. Different estimators and parameterizations are considered. We also provide details on the Mplus implementation of the Partial Credit Model (PCM), the 3...

Maurice Walker: Ameliorating culturally based extreme response tendencies to attitude items. P2

The role of response time in completing an item can have very different interpretations. Responding more slowly could be positively related to success as the item is answered more carefully. However, the association may be negative if working faster indicates higher ability. The objective of this study was to clarify the validity of each assumption for reasoning items considering the mode of pr...