st: constraint for mlogit

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

Hi All Stata Users,

I hope I won't bore all of you with my constraint questions and instead I 
hope my questions might help to inspire more research using this technique. 
Anyway, I have read the help file for mlogit but it didn't offer template 
for constraint of a single estimate in mlogit estimations. Can anyone offer 
any suggestions, let's say hypothetically my dependent variable is: 
Transport (1) bus (2) car and (3) train
and my independent variables are age, income, distance to work and gender. 
What contraint command shall I use if I were to constraint only income 
variable in this case? Thanks in advance.

Best Regards,

Hannah


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