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There probably is reverse causation, but one of the things that some of the longitudinal research suggests is that when you look at kids over time -- so controlling for baseline rates of misbehavior -- children who are disciplined with corporal punishment versus those who are not, who have the same kinds of behavior problems, show increases in behavior problems over time in a way that children who aren't disciplined that way don't, so yes, there is probably some truth to the idea that kids who are predisposed to misbehavior for whatever reason are more likely to be spanked by parents who use that form of discipline than kids who are less likely to misbehave for whatever reason.