Table 3.

NCDIF Recommended Effect Size—Moderate DIF: Category B (1PL/2PL).

Model →	1PL	2PL	2PL	2PL	2PL	2PL	2PL	2PL	2PL
Discrimination →	N/A	0.25	0.50	0.75	1.00	1.25	1.50	1.75	2.00
Difficulty ↓
−3	<0.001	0.006	0.002	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
−2	0.001	0.009	0.004	0.002	0.001	<0.001	<0.001	<0.001	<0.001
−1.5	0.001	0.009	0.006	0.003	0.002	0.001	0.001	0.001	<0.001
−1	0.002	0.010	0.007	0.005	0.003	0.002	0.002	0.001	0.001
−0.5	0.003	0.010	0.008	0.006	0.005	0.003	0.003	0.002	0.002
0	0.003	0.010	0.008	0.006	0.005	0.004	0.003	0.002	0.002
0.5	0.002	0.009	0.007	0.006	0.004	0.003	0.002	0.002	0.002
1	0.002	0.009	0.006	0.004	0.003	0.002	0.001	0.001	0.001
1.5	0.001	0.008	0.004	0.002	0.001	0.001	0.001	<0.001	<0.001
2	0.001	0.006	0.003	0.001	0.001	<0.001	<0.001	<0.001	<0.001
3	0.000	0.004	0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001

Note. NCDIF = noncompensatory differential item functioning; DIF = differential item functioning.