Creating Rank in SAS

Question

I have this data in SAS:

id	year_mont	sales
1	202201	85.28
1	202202	90.05
1	202203	85.28
1	0	85.28
1	202205	85.28
1	202206	85.28
1	202207	85.28

I need to create a rank that increases after zero and decreases before zero, per id, like that:

id	year_mont	sales	rank
1	202201	85.28	-3
1	202202	90.05	-2
1	202203	85.28	-1
1	0	85.28	0
1	202205	85.28	1
1	202206	85.28	2
1	202207	85.28	3

Is it possible to do it in SAS?

Answer 1

You need to know how many observations there are in the group and which one is the zero.

You can use a double DOW loop. The first loop to count the observations and find where the zero is. The second one to generate RANK variable and re-read the data so it can be written out.

data have;
  input id year_month sales;
cards;
1 202201 85.28
1 202202 90.05
1 202203 85.28
1      0 85.28
1 202205 85.28
1 202206 85.28
1 202207 85.28
;

data want ;
  found=0;
  do nobs=1 by 1 until(last.id);
    set have;
    by id;
    if year_month=0 then found=nobs;
  end;
  do rank=1-found to nobs-found ;
    set have;
    output;
  end;
run;

Results:

                               year_
Obs    found    nobs    id     month    sales    rank

 1       4        7      1    202201    85.28     -3
 2       4        7      1    202202    90.05     -2
 3       4        7      1    202203    85.28     -1
 4       4        7      1         0    85.28      0
 5       4        7      1    202205    85.28      1
 6       4        7      1    202206    85.28      2
 7       4        7      1    202207    85.28      3