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. Author manuscript; available in PMC: 2019 Dec 1.

Published in final edited form as: J Dev Behav Pediatr. 2018 Dec;39(9):709–714. doi: 10.1097/DBP.0000000000000615

Table 3.

Item parameter estimates from the GRM

Item	β_i1	β_i2	β_i3	β_i4	β_i5	β_i6	α_i
Combining Words	−0.726						2.933
Vocabulary Size	−2.100	−1.463	−0.480	0.355	1.078	1.807	2.925
Sentence Length	−1.734	−0.707	0.193	0.871			4.179
Imitates	−2.863	−0.558	0.876				1.519
Pretend Play	−2.297	−0.133					1.250
Following Directions	−3.220	−0.995	0.672				1.202
Word Endings	−1.021	0.626	2.072				1.554
Intelligibility	−2.340	−0.584	0.685	2.069			1.617

Note. Each item had a different number of response options, and so not all cells are filled.