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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.
