Paul von Hippel
How Not to Fool Ourselves About Heterogeneity of Treatment Effects
Topics: MethodsTags: EfficacyResearchers across many fields have called for greater attention to heterogeneity of treatment effects—shifting focus from the average effect to variation in effects between different treatments, studies, or subgroups. True heterogeneity is important, but many reports of heterogeneity… more →
School Calendars and Student Obesity
Tags: School schedulesAmple evidence documents rising student obesity in summer months and falling student obesity during the school year. One theory for this pattern is that out-of-school days lack some of the structure and health-promoting behaviors that schools provide. Given this observed seasonal pattern, a… more →
The effect of smaller classes on infection-related school absence: Evidence from the Project STAR randomized controlled trial
Tags: Class sizeIn an effort to reduce viral transmission, many schools are planning to reduce class size if they have not reduced it already. Yet the effect of class size on transmission is unknown. To determine whether smaller classes reduce school absence, especially when community disease prevalence is high… more →