Discussion on regressions identification and causality 

(1) an example of a randomized control trial (RTC) in which you clearly identify the control and treatment groups, their observable characteristics, the "treatment"and the outcome of interest;

(2) an example of a regression you may want to run about individuals various health outcomes and an observable behavior as the explanatory variable. Discuss if there are issues with the direction of causality and try to propose a valid instrument (IV).

(3) provide concrete and constructive feedback on a fellow discussion group member's original post.