For the biometric analyses, the Cholesky model provided improved fit relative to the unstructured base model (which estimated only the phenotype means and covariances) by both AIC and DIC, indicating that modeling the phenotypes in terms of latent ACE factors was reasonable, and in particular that the Cholesky version was adequate (results of model-fitting analyses are presented in Table 4). As Table 4 indicates, C influences on all phenotypes could be dropped without significant loss of fit, whereas A could not (i.e. relative to the ACE model, fit statistic values were significantly lower for the “No C” models, but not for the “No A” models). We subsequently adopted an AE model as our base model.
