(Journal Article) Burcu Atar, Kubra Atalay Kabasakal & Nermin Kibrislioglu Uysal creator text USA :Taylor and Francis Group and Routledge ,March 2023 monographic eng

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82-100 p. Abstract- The purpose of this study was to evaluate the population invariance of equating functions across country subgroups in TIMSS 2015 mathematics tests in relation to the raw-score distribution, DIF, and DTF. We used equipercentile and IRT observed-score equating methods. The results of the study indicate that there is a relationship between the population invariance and raw-score and skewness differences for both equating methods. The association between the population invariance and the number of DIF items is explicit in the equipercentile equating but not clear in the IRT equating. Furthermore, we have observed that when the number of DIF items is high, if the DTF value is relatively low, the equating errors tend to be moderate to low. ***______{For Hard Copy, Please visit Library.}________*** TIMSS Equating invariance equipercentile equating IRT observed-score equating DIF DTF 370.5 0022-0973 RIEBPL Library https://www.tandfonline.com/doi/epdf/10.1080/00220973.2021.1913978?needAccess=true https://www.tandfonline.com/doi/epdf/10.1080/00220973.2021.1913978?needAccess=true 231106 20231107153403.0