Comparability of TIMSS 2015 Mathematics Test Scores Across Country Subgroups

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 indicat...

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Bibliographic Details
Published in:The Journal of experimental education 2023-01, Vol.91 (1), p.82-100
Main Authors: Atar, Burcu, Atalay Kabasakal, Kubra, Kibrislioglu Uysal, Nermin
Format: Article
Language:English
Subjects:
Achievement Tests
Comparative Analysis
DIF
DTF
Educational tests & measurements
Elementary Secondary Education
Equating invariance
equipercentile equating
Foreign Countries
International Assessment
IRT observed-score equating
Item Response Theory
Mathematics
Mathematics Achievement
Mathematics Tests
TIMSS
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Summary: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.
ISSN:0022-0973
1940-0683
DOI:10.1080/00220973.2021.1913978