Table 2.

Model-fitting procedure, with stepwise removal of latent factors and their associated paths

Model no.	Model description	Model comparison	−2LL	Δχ2	Δdf	p	ΔAIC
1	Full	N.A.	28265.53	N.A.	(10415)	N.A.	(7435.53)
2	Drop C6	2 v. 1	28265.53	0	1	1	−2.00
3	Drop C5	3 v. 2	28265.53	0	2	1	−4.00
4	Drop C4	4 v. 3	28265.53	0	3	1	−6.00
5	Drop C3	5 v. 4	28265.53	0	4	1	−8.00
6	Drop C2	6 v. 5	28267.37	1.84	5	0.87	−8.14
7	Drop C1	7 v. 6	28276.07	8.7	6	0.19	−3.30
8	Retain C1, drop A6	8 v. 6	28267.37	0	1	1	−2.00
9	Drop A5	9 v. 8	28267.41	0.04	2	0.98	−3.96
10	Drop A4	10 v. 9	28269.52	2.11	3	0.55	−3.89
11a	Drop A3	11 v. 10	28274.59	5.07	4	0.28	−2.93
12	Drop A2	12 v. 11	28303.29	28.7	5	0	18.7

−2LL, −2Log likelihood; df, degrees of freedom; AIC, Akaike’s Information Criterion; N.A., not applicable; C, shared environmental factor; A, additive genetic factor.

^aFinal model.