Table 5.

Correlations Between Congeneric and 2PL IRT Fits, Data From 2PL IRT Model.

	Correlation in discrimination parameter			Correlation in difficulty parameter			Correlation in factor scores
2PL data vs. congeneric fit	Minimum	Median	Maximum	Minimum	Median	Maximum	Minimum	Median	Maximum
Case 1	0.656	0.909	0.983	0.991	0.997	0.999	0.998	0.999	1.000
Case 2	0.877	0.952	0.986	0.992	0.997	0.999	0.999	0.999	1.000
Case 3	0.505	0.913	0.974	0.992	0.997	0.999	0.998	0.999	1.000
Case 4	0.887	0.945	0.973	0.995	0.997	0.999	0.999	1.000	1.000
Case 5	0.696	0.914	0.963	0.994	0.997	0.999	0.998	0.999	1.000
Case 6	0.887	0.948	0.977	0.995	0.998	0.999	0.999	1.000	1.000

Note. 2PL IRT = two-parameter logistic item response theory.