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The Accuracy and Consistency of a Series of IRT True Score Equatings
Ist Teil von
Journal of educational measurement, 2012-06, Vol.49 (2), p.167-189
Ort / Verlag
Malden, USA: Blackwell Publishing Inc
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
This study investigates a sequence of item response theory (IRT) true score equatings based on various scale transformation approaches and evaluates equating accuracy and consistency over time. The results show that the biases and sample variances for the IRT true score equating (both direct and indirect) are quite small (except for the mean/sigma method). The biases and sample variances for the equating functions based on the characteristic curve methods and concurrent calibrations for adjacent forms are smaller than the biases and variances for the equating functions based on the moment methods. In addition, the IRT true score equating is also compared to the chained equipercentile equating, and we observe that the sample variances for the chained equiperc entile equating are much smaller than the variances for the IRT true score equating with an exception at the low scores.