von Davier, Holland and Thayer (2004) laid out a five-step framework of test equating which can be applied to various data collection designs and equating methods. In the continuization step, they present an adjusted Gaussian kernel method which preserves the first two moments. This paper proposes an alternative continuization method which directly uses the log-linear function from the smoothin...

In this paper test equating is considered as a missing data problem. The unobserved responses of the reference population to the new test must be imputed to specify a new cutscore. The proportion of students from the reference population that would have failed the new exam and those having failed the reference exam are made approximately the same. We investigate whether item response theory (IR...

iii Brennan Equity The notion of equity in equating was introduced by Lord (1980. pp. 195ff). The basic idea is that for any true score on Form Y, the distribution of observed scores on Form Y should be the same as the distribution of converted scores on Form X (see Kolen & Brennan, 2004. pp. 10–11). If this goal is achieved, Lord argued, then it should be a matter of indifference to each and e...

The present study aims to compare the Kernel equating and local methods in observed score equating. Functions error estimates regarding difference between raw equated scores by Stocking-Lord Haebara true-score were examined Item Response Theory Observed Score Equating. Therefore, 5, 10, 15 external anchor items used, obtained from two forms based on 2PL model. R (version 3.5.3.) programming sof...

The performance of dichotomous and polytomous IRT models in equating testletbased tests was compared in this study. To clarify the conditions under which dichotomous and polytomous item response models produce differing results, the DIMTEST program was used for testing essential unidimensionality, and a bias-corrected index (Final Condcorr) was adapted in this study for measuring local item dep...