I have data on bi-weekly expenditures on drugs, I am interested in looking at the effect of some variables on these bi-weekly expenditures. As is the case with survey data with such short intervals a lot of respondents do not report spending on drugs. Is a Tobit regression suitable for such a case?. Also, if I am interested in estimating the model for only households that report positive expenditures on drugs is Truncreg the appropriate command to use compared to OLS on positive expenditures?
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