When I used to interview a lot of college kids, I found that I could guess accurately within a few minutes of conversation which had lived in a dorm/frat house/whatever and which had lived at home while going to college. The differences in social skills and worldliness/perspective were immense. Was this due to the effects of being surrounded by a bunch of relatively ambitious young people or was it due to the socio-economic selection bias inherent in the decision to live at home while attending school? Although I have read nothing to back up this claim, I presume that there is a positive correlation between high family income and the decision to go "away" for college. Living with one's parents implies going to a local college/university vs. the one which is a tight fit with one's goals. Also, it seems that those kids who live at home socialize with their local friends who, more often than not by virtue of still living in the town where they grew up, are less ambitious and worldly. Causation is hard to tease out, but correlation is definitely present, at least based on my sampling from doing college interviewing in the Cleveland area (another cause of selection bias, of course).