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Invariance of item statistics from the two measurement frameworks: correlations of CTT and IRT Item Discrimination indexes (n=1000)

Invariance of item statistics from the two measurement frameworks: correlations of CTT and IRT Item Discrimination indexes (n=1000)

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The study investigated the invariance properties of one, two and three parameter logistic item response theory models. It examined the best fit among one parameter logistic (1PL), two-parameter logistic (2PL) and three-parameter logistic (3PL) IRT models for SSCE, 2008 in Mathematics. It also investigated the degree of invariance of the IRT models...

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Context 1
... the same sampling plan, the IRT-based estimate for the two-parameter model had moderate invariance of item discrimination estimates (r = 0.673). Table 9 showed the results of Table 7 (n=100) except that the sample correlations from Table 9 have been corrected for bias using Fisher transformed correction. None of the correlations found in Table 9 matched those found in Table 7. ...
Context 2
... the same sampling plan, the IRT-based estimate for the two-parameter model had moderate invariance of item discrimination estimates (r = 0.673). Table 9 showed the results of Table 7 (n=100) except that the sample correlations from Table 9 have been corrected for bias using Fisher transformed correction. None of the correlations found in Table 9 matched those found in Table 7. ...