The bigger the group, the smaller the chance of interracial friendship

April 15, 2013

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ANN ARBOR — The larger the group, the smaller the chance of forming interracial friendships, according to a University of Michigan study published today in the Proceedings of the National Academy of Sciences.

The study, conducted by U-M researchers Siwei Cheng and Yu Xie, examines how the size of a community affects the realization of people’s preferences for friends.  The researchers tested their theoretical model using both simulated and real data on actual friendships among 4, 745 U.S. high school students.

“We found that total school size had a major effect on the likelihood that students would form interracial friendships,” says Xie, a sociologist with the U-M College of Literature, Science and the Arts (LSA), the Institute for Social Research (ISR) and the Gerald R. Ford School of Public Policy.

“Large schools promote racial segregation and discourage interracial friendships.”

Their model incorporates the widely-held assumption that people prefer to make friends with others of the same race.  It also incorporates many other preferences that affect friendship formation.  These factors include age, education, hobbies, personality, religious affiliation and political beliefs.

Given these individual preferences, the researchers found that when the size of the social group is small, people have a low likelihood of finding a same-race friend that matches their other preferences.  But as the total size of the group increases, people are more likely to find same-race friends who also satisfy their other preferences.

Cheng, a U-M graduate student in sociology, and Xie, who is also affiliated with Peking University, note that their work has implications for other social relationships, such as dating, marriage, political coalitions, and business affiliations.

“One potential negative social consequence of the internet as a social interaction medium in an ever more globalized world is to encourage social isolation and social segmentation by expanding group size immensely,” they write.


Contact: [email protected]

By Diane Swanbrow


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