7. Consider the following causal diagram (assume it is correct):
The study exposure (E) is job-site assignment, which influences worker decisions of when to leave work (L). Unmeasured health conditions (U) also influence decisions of when to leave work and are also causally related to mortality (D). If the interest is in estimating the causal association between E and D, then which of the following is true. Explain.
a) You should control for L
b) You should not control for L
c) It makes no difference whether of not you control for L.
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