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Table 4 Relative model fit statistics (PE-GH) for unidimensional (1D) and multidimensional (MD) models

From: Assessment of fit of item response theory models used in large-scale educational survey assessments

Model LTT math age 9 Reading grade 12 Math grade 8 Science grade 12
1D 1PL/PCM 0.465 0.634 0.607 0.643
1D 2PL/GPCM 0.456 0.629 0.601 0.636
1D C3PL/GPCM 0.455 0.629 0.600 0.634
1D 3PL/GPCM 0.454 0.629 0.600 0.634
MD 3PL/GPCM 0.628a 0.600b
  1. aThree-dimensional model
  2. bFive-dimensional model