st: Constrained Regression

[vikramfinavker <vikramfinavker@gmail.com>]

Hi, 

can some one please advise me how can i run a regression which is
constrained to other variable. 

e.g. i am trying to run following regression. 
y = ∝ + βx1+ βx2+βx3+bx5 +ui which is constrained to variable x6 

my data for x1 and x6 are like this; 

x1              x6 
123423        1 
134343        1 
234234        0 
555454        1 
664543        0 
767677        0 
0                0 
.                 0 
0                1 
.                 1
12323        0 

now i want to tell stata that is should use all observations of x1 where its
grater than zero (x1>0) and select observations from 0 & missing (.) if x6
is 0. 
 so i want stata to select following observations 

x1              x6 
123423        1 
134343        1 
234234        0 
555454        1 
664543        0 
767677        0 
0                0 
.                 0 
12323        0 

If my question is not clear, please let me know. 

Thanks a lot.

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