Table 2.

Model fit statistics for total sample and 5 random samples of 300 with all 10 items

Initial solution	Total sample n=2425	Sample 1 n=300	Sample 2 n=300	Sample 3 n=300	Sample 4 n=300	Sample 5 n=300
Overall model fit, χ2 value	1727.89	262.27	212.30	204.07	194.37	282.14
df	40	40	40	40	40	40
P values	0.00000	0.0000	0.0000	0.0000	0.0000	0.0000
Item fit residuals (mean (SD))	–0.25 (6.75)	0.13 (2.49)	0.05 (2.40)	–0.23 (2.12)	0.11 (2.38)	–0.16 (2.64)
Person fit residuals (mean (SD))	–0.29 (1.32)	–0.18 (1.24)	–0.28 (1.33)	–0.34 (1.32)	–0.30 (1.37)	–0.27 (1.32)
Person Separation Index	0.84	0.84	0.83	0.85	0.82	0.83
Coefficient alpha	0.86	0.87	0.86	0.87	0.86	0.87
Unidimensionality test (% that goes beyond 95% CI)	10.3 (9.6 to 11.2)	9.3 (6.9 to 11.8)	11.7 (9.2 to 14.1)	8.3 (5.9 to 10.8)	9.0 (6.5 to 11.5)	10.33 (7.9 to 12.8)