Date: Thu, 3 May 2007 06:41:00 -0500
Reply-To: "Huang, JS" <Huang.JS@PRINCIPAL.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "Huang, JS" <Huang.JS@PRINCIPAL.COM>
Subject: Re: cumulative product?
In-Reply-To: A<1178191211.064832.152770@e65g2000hsc.googlegroups.com>
Content-Type: text/plain; charset="us-ascii"
Celia:
See if this is what you are looking for. If not, write back for more
details.
data Test;
input VarA $ VarB $ VarC;
datalines;
a A 3
a A 4
a A 5
a B 4
a B 5
a B 6
a B 7
a C 5
a D 6
a D 7
b A 4
b A 5
b A 6
b B 5
b B 6
b B 7
b B 8
b C 6
b D 7
b D 8
;
proc sort data=Test;
by VarA VarB;
run;
data Result;
retain CumuProduct;
set Test;
by VarA VarB;
if first.VarB then do;
CumuProduct=1;
end;
CumuProduct=CumuProduct*VarC;
run;
proc print data=Result;
var VarA VarB VarC CumuProduct;
run;
***** Output *****
The SAS System 06:22
Thursday, May 3, 2007 3
Cumu
Obs VarA VarB VarC Product
1 a A 3 3
2 a A 4 12
3 a A 5 60
4 a B 4 4
5 a B 5 20
6 a B 6 120
7 a B 7 840
8 a C 5 5
9 a D 6 6
10 a D 7 42
11 b A 4 4
12 b A 5 20
13 b A 6 120
14 b B 5 5
15 b B 6 30
16 b B 7 210
17 b B 8 1680
18 b C 6 6
19 b D 7 7
20 b D 8 56
-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
celiacai@GMAIL.COM
Sent: Thursday, May 03, 2007 6:20 AM
To: SAS-L@LISTSERV.UGA.EDU
Subject: cumulative product?
Hi
I knew there's certain way to calculate subgroup cumulative sum in a
table...but how can I calculate the cumulative product of subgroups
within a dataset?
Say, the ovservations are sorted by variable A,B and C (namely
subgrouped twice), and I want to find out the product of all Cs within
each B-group. How could I do that?
celia
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