| Summary: | Homophily, the tendency for like to associate with like or for birds of a feather to flock together, is one of the most robust findings in all of social science. Despite its ubiquity and obvious importance, however, it is uncertain how much of this regularity derives from the tendency to become friends with those like ourselves (i.e. selection) as opposed to the tendency to become like those with whom we associate (i.e. harmonization). This dissertation grapples with the issue by proposing, first, that both forces play a role and, second, that the impact of one cannot be understood without also considering the effect of the other. After a review of the literature, theory is developed, data introduced, analytical techniques described, and then empirical analysis is undertaken. It is determined that several of the predicted combinations of selection and harmonization are, indeed, present and that these combinations can meaningfully inform our understanding of social life. Directions for future research are then discussed.
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