Background: Recently, the high prevalence of problematic digital media use among youth has become a public concern. Therefore, this study investigated digital citizenship's moderating effects on a supportive school environment, parental pressure to achieve, academic stress, problematic digital media use, and happiness in school-aged children.…

This tutorial addresses possible sources of confusion in interpreting trait scores from the bifactor model. The bifactor model may be used when subscores are desired, either for formative feedback on an achievement test or for theoretically different constructs on a psychological test. The bifactor model is often chosen because it requires fewer…