Create group count for category types

[Sathish_jammy]

Hi Experts, 

I need to create the group type in numbers for the following dataset

data have;
input G_Type$10.;
cards;
ABI
ABI
BIG
BIG
BIG
RET
run;

Expected output:

G_Type	Want
ABI	1
ABI	1
ABI	1
BIG	2
BIG	2
BIG	2
RET	3

Thanks in advance!

[PeterClemmensen · Accepted solution]

If your data is sorted, do this

data want;
   set have;
   by G_Type;
   if first.G_Type then want + 1;
run;

[RichardDeVen]

G_TYPE appears to be already ordered in an ascending manner.

Is there a reason you can't use G_TYPE directly?

Are you using 'want' to maintain original G_TYPE order ?