https://academic.oup.com/ije/advance-article/doi/10.1093/ije/dyac135/6609840 Reflection on modern methods: constructing directed acyclic graphs (DAGs) with domain experts for health services research Abstract. Directed acyclic graphs (DAGs) are a useful tool to represent, in a graphical format, researchers’ assumptions about the causal structure among variab academic.oup.com 제목 : Reflection on m..