to determine whether genetic influences on the endophenotypes account for significant genetic variance in EXT. We subsequently assessed whether genetic factors beyond A1 (which represent genetic variance in externalizing shared with all the endophenotypes) would be significant, and particularly whether there would be gender differences in this regard. We used several fit statistics to evaluate model fit: likelihood-ratio tests, Akaike’s Information Criterion (AIC; Akaike, 1974) and Draper’s Information Criterion (DIC; Draper, 1995).
