Mediation analysis is widely applied in various fields of science, such as psychology, epidemiology, and sociology. In practice, many psychological and behavioral phenomena are dynamic, and the corresponding mediation effects are expected to change over time. However, most existing mediation methods assume a static mediation effect over time,…

Multisite trials that randomize individuals (e.g., students) within sites (e.g., schools) or clusters (e.g., teachers/classrooms) within sites (e.g., schools) are commonly used for program evaluation because they provide opportunities to learn about treatment effects as well as their heterogeneity across sites and subgroups (defined by moderating…

Narrative storytelling surrounds us. Narratives are especially salient in politics, as policy problems do not simply exist, but are actively created through the stories policy actors tell. Scholars introduced the narrative policy framework (NPF) to create a generalized framework for studying how policy actors use storytelling strategically to…

Background: Spatial thinking skills are strongly correlated with achievement in Science, Technology, Engineering, and Mathematics (STEM) fields and emerging research suggests that interventions aimed at building students' skills will likely yield measurable impacts on learning across K-12 settings. The importance of spatial thinking in science has…

Charter school policy represents two simultaneous forms of accountability, in which schools are accountable to both parents and authorizers. This study of a K-8 charter renewal decision interrogates these accountability relationships and the role of race and power in privileging the interests of particular stakeholders over others. Using…

In causal mediation analysis, the definitions of the natural direct and indirect effects involve potential outcomes that can never be observed, so-called a priori counterfactuals. This conceptual challenge translates into issues in identification, which requires strong and often unverifiable assumptions, including sequential ignorability.…