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Large-scale Assessments in Education

An IEA-ETS Research Institute Journal

Table 2 Model fit statistics

From: An item response theory approach to longitudinal analysis with application to summer setback in preschool language/literacy

   Model Fit
DIF Model AIC BIC
No DIF Adjustment 1PL 69456.0 69696.9
2PL 70302.8 70582.9
DIF Adjusted 1PL 68018.8 68606.5
2PL 69209.6 69666.7
  1. Note. A smaller AIC or BIC indicates a better-fitting model.
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