Because we oversampled high scorers on neuroticism, we also conducted a weighted analysis that gave less weight to high scorers on neuroticism. Using logistic regression, we analyzed the screened sample and modeled the probability of a participant entering the study as a function of the EPQ-R-N. Then, we weighted each case on the reciprocal of this probability. This approach gave more weight to cases that were less likely to be in our analyses. Because the correlation between internalizing psychopathology and neuroticism approached 1.0, we specified in Mplus that this correlation be less than .99. When we repeated our analysis in the weighted sample, we obtained very similar results with good fit indices (CFI=.94, RMSEA=.03, WRMR=.94).
