I'm trying to run the proc panel procedure and my code is
proc sort data=cs;
by state year;
run;
proc panel data=cs;
id state year;
slag pop(1)...etc / out=cslag;
run;
but I keep getting the error saying that variable number 0 is not on file. I'm not sure what this means or how to correct it because I don't have any variables with that name. Could anyone provide some assistance?
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