Hello everyone,
Thanks in advance for your help!
I have a data like this:
X1 X2 X3 ...
1 ... ...
1 ... ...
2 ... ...
2 ... ...
2 ... ...
3 ... ...
4 ... ...
4 ... ...
and I want to create a new variable (called Y) with binary values, which makes the data as such:
X1 X2 X3 ... Y
1 ... ... 0
1 ... ... 1
2 ... ... 0
2 ... ... 1
2 ... ... 1
3 ... ... 0
4 ... ... 0
4 ... ... 1
In other words, it puts 0 for a unique value of X1, 0 for the first non-unique value, and 1 for the remainder of non-unique values. I was wondering how it can be done in SAS. Any idea/help is really appreciated!
Assuming data is sorted by X1 then do:
data want;
set have;
by X1;
if first.x1 then y=0; else y=1;
run;
Assuming data is sorted by X1 then do:
data want;
set have;
by X1;
if first.x1 then y=0; else y=1;
run;
Similar method, slightly different calculation, since that's exactly what FIRST does, flip the indicator.
data want;
set have;
by X1;
y=1-first.x1;
run;
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