Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 5 Item fit index of Chalmers and Ng’s Q1 statistics for NRM and GPCM

From: Exploration of the linear and nonlinear relationships between learning strategies and mathematics achievement in South Korea using the nominal response model : PISA 2012

	Q1	degree of freedom	RMSEA	p-value
NRM
Item 1	20.173	16	0.009	0.213
Item 2	18.051	16	0.006	0.321
Item 3	18.933	16	0.007	0.272
Item 4	26.132	16	0.014	0.052
GPCM
Item 1	17.786	17	0.004	0.402
Item 2	20.233	17	0.008	0.262
Item 3	20.393	17	0.008	0.255
Item 4	39.511*	17	0.020	0.002

*p < .01.

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