Large-scale Assessments in Education

An IERI – International Educational 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
No DIF Adjustment	2PL	70302.8	70582.9
DIF Adjusted	1PL	68018.8	68606.5
DIF Adjusted	2PL	69209.6	69666.7

Note. A smaller AIC or BIC indicates a better-fitting model.

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