. Author manuscript; available in PMC: 2017 Jun 13.

Published in final edited form as: Assessment. 2015 Aug 17;23(6):758–768. doi: 10.1177/1073191115599639

Table 4.

Free Baseline DIF Tests for Language.

Model	−2 log likelihood	AIC	G²	df	G² difference from baseline	df Difference from baseline	Chi-square p
Baseline	426,500	426,830	14348.73	15,459	—	—	—
Item 1 (nervous)	426,915	427,195	14386.47	15,484	37.74	25	.05
Item 2 (hopeless)	426,843	427,123	14384.83	15,484	36.10	25	.07
Item 3 (restless)	427,110	427,390	14388.65	15,484	39.92	25	.03
Item 4 (depressed)	426,895	427,175	14407.46	15,484	58.73	25	.0002
Item 5 (everything an effort)	426,985	427,265	14377.80	15,484	29.07	25	.26

Note. DIF = differential item functioning; AIC = Akaike information criterion; df = degrees of freedom. Item 6 (worthless) was used as a reference item.