Quote:
Originally Posted by isaidso
Did they really need to do a study to realize there was a correlation?
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More interesting than the correlation (which is obvious) would be to understand whether one leads to the other (i.e., if there is any causal relationship).
As noted above I think there are probably multiple relationships between population trends and homicide rates... both common causes (i.e., weakening economy) and related to population sample (the people that stay are more likely to commit murder than the people who left).