Directed acyclic graphs (DAGs) are now a popular tool to inform causal inferences. We discuss how DAGs can also be used to encode theoretical assumptions about nonprobability samples and survey nonresponse and to determine whether population quantities including conditional distributions and regressions can be identified. We describe sources of…

Influencing major education policies in the US such as school vouchers and charter schools, market theory assumes that organizational autonomy, parental choice, and competition between schools improve the quality of education. However, whether those policies can influence the instructional core of schools is not well understood. Comparing private…

Physical education can be a subject that students find challenging when they are given little autonomy. This article explores two high school case studies, in the UK and Australia respectively, where students were given a great deal of choice over their learning and assessment journeys. In the UK case study, a Sport England survey was used with…