![]() Try add up your five chosen dummies and see if they do add up all to 1.Īnother possibility is that you have a region that has no wine entry, causing it to contain only zero and subsequently thrown out from the regression model.Īnd lastly, in Stata, you do not need to compose your own dummies (unless you're told to do so by the assignment, etc.) You can use an "i." prefix to specify a variable being categorical: sysuse census, clear ![]() ![]() Your dummies might have been calculated incorrectly. Please either provide more details on the data or a source where we can look at it if it's publicly available.Īs for your problem, there could be many reasons. There are many data sets that can be called "wine.dta." Just because you have used it does not mean we also know it.
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