Another set of investigators decided to deal with the problem of potential bias

Another set of investigators decided to deal with the

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5.Another set of investigators decided to deal with the problem of potential bias due to differences in family income by only studying women in the lowest quartile of family income. Assuming the relationships described above still hold, draw the DAG. 6.Using the design described in question 5, would the crude association between husband’s tobacco smoking and all-cause mortality be a valid estimate of the causal effect? Why or why not? 3
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EPI 201 Fall 2017 Page 4 of 5 DAG Practice Problems Part IIAnother set of investigators were interested in whether husband’s smoking was related to the occurrence of lung cancer in these women. These investigators decided to conduct a density-sampled case-control study. Cases were identified through the local lung cancer registry that is updated in real time and is comprehensive (includes all known cases in the study catchment area within a month of diagnosis). Controls were selected during the case-accrual period from women who attended Tai-Chi centers. Assume that women who attended these Tai-Chi centers were more likely to live in neighborhoods with higher than average population density. Furthermore, women who live in densely
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