Large-scale Assessments in Education

An IERI – International Educational Research Institute Journal

Table 6 Comparison between boundary discrimination parameters of NRM and discrimination parameters of 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

		NRM
		a₁^*	a₂^*		a_GPCM
Item_1		0.73 (0.11)	0.42 (0.18)		0.567 (0.187)
Item_2		−0.13 (0.12)	0.43 (0.14)		0.333 (0.097)
Item_3		−0.67 (0.41)	0.95 (0.42)		0.303 (0.079)
Item_4		−2.00 (2.01)	2.05 (2.01)		−0.059 (0.054)

Note. The item parameters in bold denote significant differences between boundary discriminations.

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