TABLE V.

Multivariate Longitudinal Model-Fitting Results for Reactive and Proactive Aggression, at Ages 9–10 and 11–14 Years

		Overall fit					Model difference test
Model no.		−2LL	DF	AIC	BIC	Compared to model no.	Δχ2	Δdf	P
1	Cholesky: equate parameters in males and females	10,486.14	4,192	2,102.14	−8,250.46
2	2-Factor Common Pathway: equate parameters in males and females	10,491.27	4,199	2,093.27	−8,270.43	1	5.13	7	.64
2a	Drop common genetic factor	10,510.03	4,202	2,106.03	−8,270.70	2	18.77	3	<.001
2b	Drop common shared environmental factor	10,492.72	4,202	2,088.72	−8,279.35	2	1.46	3	.69
2c	Drop common genetic and shared environmental factors	10,622.80	4,205	2,212.80	−8,223.98	2	131.53	6	<.001
2d	Drop common shared environmental factor and time-specific genetic effects (reactive and proactive aggression, Wave 1) and time-specific shared environmental effects (reactive and proactive aggression, Wave 2)	10,495.79	4,206	2,083.79	−8,290.70	2	4.52	7	.72

−2LL, −2(log-likelihood); AIC, Akaike’s Information Criterion; BIC, Bayesian Information Criterion.