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Download full textZhang, Jinming – ETS Research Report Series, 2004
This paper extends the theory of conditional covariances to polytomous items. It has been mathematically proven that under some mild conditions, commonly assumed in the analysis of response data, the conditional covariance of two items, dichotomously or polytomously scored, is positive if the two items are dimensionally homogeneous and negative…
Descriptors: Test Items, Test Theory, Correlation, National Competency Tests
