Group by in sas Data step

[Ankita]

Hi,

Below is a data set, I need to find the identifier, its count and payout greater than 45

identiferpayoutregion

1	10	1
2	20	2
3	10	1
4	20	3
5	10	1
6	20	2
7	10	3
8	20	3
9	10	2
10	20	4
11	10	4
12	20	2

I want output like:

regioncount identifiersum payout

2              4                              70

3              3                              50

How to group by in data step with aggregate functions using first. and last.

Thanks and Regards,

Ankita

[Reeza]

Can you please post what you've tried. You're correct in needing first/last and BY group processing but it sounds like a homework assignment and hopefully you've attempted it. 

Logic. 

If first of group then

    set sum to first value

if last of group

    increment running total

    check if total is over 45

    if over 45 output

if not first or last

    add to total (running total). 

[PGStats · Accepted solution]

Even simple things can be done in many different ways. My favourite when dealing with BY groups, with FIRST and LAST conditions available, is FIRST - All - LAST.

FIRST - All - LAST logic : 

If first of group then
    set initialize sum to 0
add to sum (running sum)
if last of group and sum is over 45
    output

[Ksharp]

data have;
infile cards expandtabs truncover;
input obs a b ;
cards;
1	10	1
2	20	2
3	10	1
4	20	3
5	10	1
6	20	2
7	10	3
8	20	3
9	10	2
10	20	4
11	10	4
12	20	2
;
run;

proc sql;
create table want as 
 select b,count(*) as count,sum(a) as sum 
  from have 
   group by b 
    having calculated sum gt 45 ;
quit;