I have explanatory variables that are proportions of the population in each age group, so the values add to 1 for each observation. When I regress y on those x's one of the x's is omitted, and a constant term is estimated. (As I expected.) I tried running the same regression using the noconstant option, and stata eliminated the constant, but still omitted one of the x's. Can someone help me figure out how to include all x's without the constant term? Is noconstant not the right command for this?
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