Table 3.

Differential Item Functioning Analysis for Words Produced.

Word	HR ASD		Non-ASD Comparison
	Ability†	Ability Standard Error	Group	Ability	Ability Standard Error	Ability Contrast††	More Likely for…	Rasch-Welch t statistic
baabaa	−5.31	.49	LR	−3.60	.28	1.71	HR ASD	3.02**
block	−2.54	1.06	LR	1.45	1.68	3.99	HR ASD	2.01*
bye	−5.31	.49	LR	−4.10	.25	1.21	HR ASD	2.19*
baabaa	−5.31	.49	HR	−3.89	.25	1.42	HR ASD	2.55**
uncle	−2.54	1.08	HR	1.08	1.14	3.61	HR ASD	2.30*
hello	−3.32	.77	HR	−1.17	.53	2.15	HR ASD	2.31*
bite	−2.54	1.06	HR	1.08	1.14	3.62	HR ASD	2.32*

Note.

^†Ability level measured in logits, (DIF: differential item functioning). The more negative an ability estimate for a group the more likely it was produced by the specified group. Only meaningful differences are shown DIF>1 and p < 0.05..

^††Ability contrasts calculated as HR ASD Ability minus comparison group Ability. Absolute values greater than one indicate large effect size (see appendix A).

^*Significant at p≤0.05,

^**p<0.01.