Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 3 DIF statistics (1PL model)

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

	Item	AIC	BIC	Change
All Constrained		69456.0	69696.9	--
Free	1	68898.0	69197.8	−558.1
	2	69120.3	69420.1	−335.7
	3	69057.2	69357.0	−398.8
	4	69286.3	69586.1	−169.7
	5	69438.2	69738.0	−17.9
	6	69430.4	69730.2	−25.7
	7	69301.7	69601.5	−154.3
	8	69273.8	69573.6	−182.3
	9	69415.3	69715.1	−40.8
	1-3	68179.6	68597.3	−1276.5

Note. Change statistics are based on the simulated distribution of −2 log likelihood of the fitted model. The change values in the last column can be roughly interpreted as chi-square statistics with 12 degrees of freedom.

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