Language Testing in Asia

Table 1 Summary statistics for person and item measures*

From: Measuring differential item and test functioning across academic disciplines

Person	Score	Count	Measure	Infit		Outfit
				MNSQ	ZSTD	MNSQ	ZSTD
Mean	34.3	61	53.27	1.0	.0	99	.0
S.D.				.14	1.0	.25	1.0
Items
Mean	183	325	50.00	.99	.1	.99	.2
S.D.	72.4	.7	12.14	.07	1.5	.15	1.7

* MNSQ – Mean-square, ZSTD – standardized z-score.

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