Bystanders play an essential role in school bullying prevention. This study examines student bystanders' perceptions of severity and willingness to intervene in scenarios involving physical, verbal, relational, and cyberbullying. It focuses on five distinct victim reactions: pretending nothing happened, seeking help, fighting back, crying, and no…

Changepoints are abrupt variations in a sequence of data in statistical inference. In educational and psychological assessments, it is pivotal to properly differentiate examinees' aberrant behaviors from solution behavior to ensure test reliability and validity. In this paper, we propose a sequential Bayesian changepoint detection algorithm to…

The response patterns of youth who witness bullying have potential to influence future occurrence and persistence of bullying behaviors. Prevention efforts have included an increased focus on bystander interventions; however, the majority of adolescents rarely intervene in bullying situations. When they do, they often display of mixed pattern of…