State law (Revised Code of Washington [RCW] 28A.320.130) requires the Office of Superintendent of Public Instruction (OSPI) to annually report to the Legislature the number of incidents in violation of RCW 9.41.280, which involves the possession of weapons on school premises, transportation systems, or in areas of facilities while being used…

The American School Shooting Study (TASSS) is an ongoing mixed-method project funded by the National Institute of Justice to catalog US school shootings. It has amassed data based on open sources and other public materials dating back to 1990. This brief presents new insights from TASSS, diving deeper into the database's potential to examine the…

In standard statistical data analysis, the effects of intervention or prevention efforts are evaluated in terms of variable relations. Results from application of regression-type methods suggest whether, overall, intervention is successful. In this article, we propose using configural frequency analysis (CFA) either in tandem with regression-type…

Change-point analysis (CPA) is a method for detecting abrupt changes in parameter(s) underlying a sequence of random variables. It has been applied to detect examinees' aberrant test-taking behavior by identifying abrupt test performance change. Previous studies utilized maximum likelihood estimations of ability parameters, focusing on detecting…

The purpose of this study is to investigate the predictive effects of maternal parenting styles and beliefs about emotions on the social skills and problem behaviours of preschoolers. The study involved 227 mothers of 3-6-year-old preschool children (M[subscript age] = 63 months). Two hierarchical regression analyses were conducted to determine to…

Bias influencing teachers' classroom management is increasingly clear, but the circumstances that influence the likelihood of relying on those biases are less understood. This study employed Classification and Regression Tree (CART) analysis, resulting in four models examining how teachers' appraisals of first-grade students' externalizing problem…