Counter Flags

[Adnan_Razaq]

Hi,

I have the following dataset

Account ID  Month  Arrears

1                    1           0

1                    2           1

1                    3           0

1                    4           1

1                    5           2

1                    6           2

1                    7           0

and need the foloowing dataset - if arrears gt 0 then count months since last 0 in arrears

Account ID  Month  Arrears       Count

1                    1           0                  0

1                    2           1                  1     

1                    3           0                  0

1                    4           1                  1

1                    5           2                  2

1                    6           2                  3

1                    7           0                  0

Any help to code this scenario would be helpful.

Thanks

Adnan

[Shmuel · Accepted solution]

Try next code:

data want;

  set have;

   by  id;

        retain count;

       if first.id or arrears=0 then count=0;

      else count+1;

run;