The standard error of equating is a useful index to quantify the amount of equating error. It is the standard deviation of equated scores over replications of an equating procedure in samples from a population or populations of examines. The current study estimates the SE of item response theory true score equating in the Nonequivalent Groups with Anchor Test design using simulations. Specifica...

Consistent behavior is a desirable characteristic that common items are expected to have when administered to different groups. Findings from the literature have established that items do not always behave in consistent ways; item indices and IRT item parameter estimates of the same items differ when obtained from different administrations. Content effects, such as discrepancies in instructiona...

The research described in this paper deals solely with the effect of the position of an item within a test on examinee's responding behavior at the item level. For simplicity's sake, this effect will be referred to as practice effect when the result is improved examinee performance and as fatigue effect when the result is poorer examinee performance. Item response theory item statistics were us...

The purpose of this study was to compare the equating errors item and ability parameters obtained by performing scale transformation methods two multidimensional test forms under various conditions. Sample size (1000-2000), common ratio (20% 40%), correlation between dimensions (0.1-0.5-0.9) parameter estimation model (2PLM-3PLM) were taken as research Equating error (RMSE) used examine accurac...

In this digital ITEMS module, Dr. Stella Kim provides an overview of multidimensional item response theory (MIRT) equating. Traditional unidimensional (IRT) equating methods impose the sometimes untenable restriction on data that only a single ability is assessed. This module discusses potential sources multidimensionality and presents consequences To remedy these effects, MIRT can be used as v...