. Author manuscript; available in PMC: 2008 Jun 20.

Published in final edited form as: J Abnorm Child Psychol. 2007 Oct 27;36(3):433–444. doi: 10.1007/s10802-007-9189-1

Table 4.

Model Fitting Results for Past Year and Lifetime Data

	−2 ln L	df	AIC	Δχ²	df	p
Past Year
1. Full ACE model	4576.64	5493	−6409.36	--	--	--
2. r_g dropped	4596.32	5494	−6391.68	19.68	1	<.01
3. r_c dropped	4577.36	5494	−6410.64	0.72	1	0.40
4. r_e dropped	4578.17	5494	−6409.83	1.53	1	0.22
5. r_c and r_e dropped	4578.17	5495	−6411.83	1.53	2	0.79
6. r_c, r_e, and C for CD dropped	4578.17	5496	−6413.83	1.53	3	0.68
7. r_c, r_e, C for CD and C for MDD dropped*	4578.17	5497	−6415.83	1.53	4	0.82
Lifetime
1. Full ACE model	7082.96	5493	−3903.04	--	--	--
2. r_g dropped	7101.22	5494	−3886.78	18.26	1	<.01
3. r_c dropped	7083.50	5494	−3904.50	0.54	1	0.46
4. r_e dropped	7087.89	5494	−3900.11	4.93	1	0.03
5. r_c and C for CD dropped	7083.50	5495	−3906.50	0.54	2	0.76
6. r_c, C for CD, and C for MDD dropped*	7083.50	5496	−3908.50	0.54	3	0.91

Note. Full ACE model includes r_g, r_c and r_e. Best-fitting model is indicated by an asterisk (*). −2 ln L = fit statistic, negative two times the log-likelihood; df = degrees of freedom, Δχ² = difference in chi square from full ACE model; p = probability; AIC = fit statistic, Akaike Information Criterion; A = genetic influence; C = shared environmental influence; E = nonshared environmental influence; r_g = correlation between genetic influences on each disorder; r_c = correlation between shared environmental influences on each disorder; r_e = correlation between nonshared environmental influences on each disorder; CD = conduct disorder; MDD = major depressive disorder.