st: symmetry and homogeneity restrictions

[Camilla Andersson <camilla.andersson@econ.umu.se>]

Dear all stata users,

My question is simply: How do I impose symmetry and homogeneity 
restrictions in stata?

For example if I want to estimate a regression an impose the parameter 
restrictions bnk=bkn

and the sum of all betas is equal to 0?



Kind regards

Camilla

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