Create observation count variable - X

[mayasak]

Hi,

I have a cancer data set and I need to create an X variable (observation count). What's the codings used in this case.

Thanks

[Reeza · Accepted solution]

SAS has an automatic variable that can be used as an observation counter. This assumes you want a row counter. If you want to count observations by groups or some other method you need to provide more details, preferably sample input and output. 

Data want;
Set sashelp.class;
X = _n_;

Run;

Proc print data=want label;
Run;

[mayasak]

Thank you

[RW9]

Its always a good idea to post test data (in the form of a datastep), and what the output should look like.  We can only work with what you post here.  Do you mean you want an equivalent to the SAS automatic variable _n_ or a total observations?