st: Re: constraints

["Hannah Kewsberry" <hannah_kewsberry@hotmail.com>]

Dear Sir,

I have tried to work on the similar template on mlogit as you have suggested 
but Stata has given me the response:'invalid syntax'. Could you kindly 
suggest where have I gone wrong?

Thanks.

Regards

Hannah



---

> Presuming that you are using linear regression,
> g totearn = earn1 + earn2 + earn3
> reg par e1 e2 e3 race status totearn
> does this by substituting the constraint into the model. Alternatively,
> cons def 1 earn1=earn2
> cons def 2 earn1=earn3
> cnsreg par e1 e2 e3 race status earn*, c(1 2)
> Since you are applying two constraints to the coefficient vector (i.e. if 
> you ran the unconstrained regression and tested earn1=earn2=earn3, you 
> would be doing an F with 2 and ? d.f.), you must define two constraints.

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