This study explores the task-specific self-efficacy of 1815 Chinese fourth graders and 1767 eighth graders as well as its relationship to their problem-posing performance and the moderating effect of grit on this relationship. the linear regression model, generalised additive model (GAM) and continuous threshold regression model (CTRM) were used.…

To examine developmental processes, intervention effects, or both, longitudinal studies often aim to include measurement intervals that are equally spaced for all participants. In reality, however, this goal is hardly ever met. Although different approaches have been proposed to deal with this issue, few studies have investigated the potential…