Homophily in stable and unstable adolescent friendships: Similarity breeds constancy

This study examines homophily among adolescent friends. Participants were drawn from a community-based sample of Swedish youth who ranged from 11 to 18 years old. A total of 436 girls and 338 boys identified their closest friends and described their own delinquent activities, intoxication frequency, achievement motivation, and self-worth. Correlations and difference scores describe similarity between reciprocally nominated friends on each dimension. Adolescents who remained friends from one year to the next tended to be more similar than those who did not, during the friendship and, to a lesser extent, before the friendship. Comparisons with random pairs of same-age peers revealed that age-group homophily accounts for most of the similarity between unstable friends but only a fraction of the similarity between stable friends.

► Stable and unstable friends are contrasted before and during their friendship.
► Stable friends are more similar than unstable friends.
► Unstable friends are no more similar than randomly chosen peers.
► Similarity forecasts the stability of a friendship.