Table 2.

Item Parameters Using Birnbaum (Lord, 1968) Parameterization.

Item	b	a	c
1	−0.07	0.49	0.19
2a	0.21	0.92	0.15
3	0.54	1.26	0.05
4b	−0.03	0.61	0.18
5	0.01	1.74	0.12
6	1.96	0.5	0.12
7b	0.04	0.96	0.13
8	−0.09	0.59	0.18
9	−1.16	0.82	0.17
10a	0.02	1.26	0.11
11	0.2	0.82	0.07
12	−0.43	0.75	0.15
13b	−0.06	1.49	0.09
14	−0.34	0.97	0.12
15	0.05	1.49	0.12
16	−0.25	0.89	0.15
17a	0.06	1.45	0.07
18	0.31	0.75	0.18
19b	0.04	1.43	0.08
20	0.13	0.6	0.22
21	0.52	0.83	0.09
22b	−0.96	0.56	0.19
23	−0.79	0.67	0.2
24	0.37	0.7	0.18
25a	−0.71	1.03	0.14
26	−0.19	0.89	0.21
27	0.74	1.23	0.06
28b	−0.44	0.9	0.18
29	−0.17	1.23	0.12
30	0.53	0.69	0.17

^aDenotes differential item functioning (DIF) items under 20% and 33% DIF conditions. ^bDenotes DIF items under only 33% DIF conditions. (In those DIF items, .7 was added to the b parameter for the focal group.)