This introduction to the R package plink is a (slightly) modified version of Weeks (2010), published in the Journal of Statistical Software. The R package plink has been developed to facilitate the linking of mixed-format tests for multiple groups under a common item design using unidimensional and multidimensional IRT-based methods. This paper presents the capabilities of the package in the co...

This study aims at investigating the equivalence of mathematics try out scores junior high school through anchor. In study, 2 Parameters Logistic (2PL) model Item Response Theory (IRT) analysis was used Haebara method. The estimation step equating parameter utilized equateIRT package in R program. results show that relationship between questions 1 and cannot be said to equivalent. After analyzi...

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...

The purpose of this dissertation was to investigate how different Item Response Theory (IRT)-based calibration methods affect student achievement growth pattern recovery. Ninety-six vertical scales (4 × 2 × 2 × 2 ×3) were constructed using different combinations of IRT calibration methods (separate, pair-wise concurrent, semiconcurrent, and concurrent), lengths of common-item set (10 vs. 20 com...

In this study the Mantel-Haenszel procedure, widely used in studies for identifying differential item functioning, is proposed as an alternative to the delta-plot method and applied in a test-equating context for flagging common items that behave differentially across cohorts of examinees. The Mantel-Haenszel procedure has the advantage of conditioning on ability when making comparisons of perf...

The PISA 2006, 2009, 2012 and 2015 assessments use the same science performance scale, which means that score points on this scale are directly comparable over time. The same is true for the reading performance scale used since PISA 2000 and the mathematics performance scale used since PISA 2003. Comparisons of scores across time are possible because some items are common across assessments and...