Fit statistics for the common factor model, in which all externalizing phenotypes and SUDs loaded onto a single factor, did not meet our prespecified threshold for good model fit. Nevertheless, the standardized factor loadings of the indicators were high (median ƛ = 0.65) and uniform (SD of ƛ = 0.10), indicating that the common factor was well and similarly defined by its indicators. In further support of this, H and ωt were high (0.97 and 0.89, respectively).
