Hi Dr. Chan,
I just wanted to seek some clarification about how many DAGs we are expected to draw for each question in the assignment, for example question one says : "In the first column of page 784, a paragraph begins with “The key question is whether this strong inverse association reflects a truly protective of smoking on the risk of developing PD.” Draw a causal DAG that is consistent with the explanation given in this paragraph".
In the paragraph from the paper however, three potential explanations are given, are we supposed to draw DAGs for each of these explanations or just pick the one we think is most plausible and draw a DAG for that one?