st: Regression Constrained to other variable

[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 its my question is not clear, please let me know.

thanks a lot.

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