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. Author manuscript; available in PMC: 2017 Jul 5.
Published in final edited form as: J Autism Dev Disord. 2016 Mar;46(3):899–909. doi: 10.1007/s10803-015-2632-1

Fig. 1.

Fig. 1

Hypothetical Item Characteristic Curves for a word in which performance in the two populations showed significant DIF (equivalent to 1 logit or greater). Specifically, DIF favored the LR Non-ASD group in that the ability levels required by them to be successful on that word 50% of the time (stars) were equal to zero logit (average ability) compared to +1 logit (higher than average ability) for the HR ASD group. In addition, children of average language ability (zero logit) in the HR ASD group have only a 15% probability of using this word (triangle).