For this study, information on Who Bullies Who was collected from 54 school classes with 918 children (M age = 11) and 13,606 dyadic relations. Bullying and victimization were viewed separately from the point of view of the bully and the victim. The two perspectives were highly complementary. The probability of a bully-victim relationship was higher if the bully was more dominant than the victim, and if the victim was more vulnerable than the bully and more rejected by the class. In a bully-victim dyad, boys were more often the bullies. There was no finding of sex effect for victimization. Liking reduced and disliking increased the probability of a bully-victim relationship.,
Child Development
Erasmus MC: University Medical Center Rotterdam

Veenstra, R., Lindenberg, S., Zijlstra, B., de Winter, A., Verhulst, F., & Ormel, J. H. (2007). The dyadic nature of bullying and victimization: Testing a dual-perspective theory. Child Development, 78(6), 1843–1854. doi:10.1111/j.1467-8624.2007.01102.x