It is also important to note that we did not model some potentially interesting parameters and disorders. We had considered including psychopathological phenomena that were either broader or narrower than those included in our models. In terms of a broader focus, it has been shown that externalizing psychopathology such as anti-social personality disorder and drug abuse are correlated with both alcohol dependence and internalizing psychopathology (Krueger, 1999). In terms of a narrower focus, Markon (2010) studied the common structure of internalizing disorders from the standpoint of symptoms rather than diagnoses and others have argued that temperament and primary personality features such as neuroticism may be a unifying process linking the internalizing disorders to each other (Brown, 2007; Clark, 2005; Krueger and Eaton, 2010; Tang et al., 2009) and to alcohol dependence (Cloninger, 1987; Lahey, 2009). In fixing the scope of psychopathology in the models as we did, we attempted to maximize the relevance of our findings to the broad base of researchers and clinicians that continue to focus specifically on the association of internalizing disorders and alcohol dependence. (Brown et
