In this study, school children wore a validated accelerometer and completed the Previous Day Physical Activity Recall for three consecutive days. When applied to the holdout sample, an algorithm of predicted minutes of moderate to vigorous physical activity showed good agreement with the actual...

This paper compares the precision gains from adjusting impact estimates for student-level pretest scores (which can be costly to collect) with the gains associated with using publically available school-level proficiency data (available at low cost), using data from five large-scale randomized...

This brief provides five checklists to help researchers provide complete information describing (1) their study's measures; (2) data collection training and quality; (3) the study's reference population, study sample, and measurement timing; (4) evidence of the reliability and construct validity...

This article is the eighth in a series exploring the importance of research design, statistical analysis, and epidemiology in nutrition and dietetics research. It is the second article in that series focused on multivariate statistical analytical techniques. This review examines the statistical...

On an average school day, school lunch participants consume more fruits and vegetables, including relatively more at school and less away from school compared to nonparticipants.

Reports initial findings from a synthesis and reanalysis of all available evidence on whether quasi-experimental evaluation designs produced unbiased estimates of the impacts of education, training, and welfare programs. This methodological paper tries to understand conditions under which...

Social network analysis, a methodological approach to measuring and mapping relationships, can be used to study whole networks, all of the ties within a defined group, or connections that individuals have in their personal communities. This brief introduces the concepts behind SNA and...

Orthogonal design affords an opportunity to design interventions in real-world settings and to study intervention components that can be implemented in various ways. This issue brief introduces orthogonal design, describes key design and implementation considerations, and illustrates how it can...