My data is
A B C
1 0 1
0 0 0
1 1 0
0 0 1
1 1 1
What to create a flag variable which is missing when A or B or C have 1 and flag variable should be . when all three of them have 0
WANT dataset like
A B C nmiss
1 0 1 .
0 0 0 1
1 1 0 .
0 0 1 .
1 1 1 .
Any quick way to do this?
if sum(a,b,c)=0 then flag=1;
else flag=.;
Thank you!
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