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Date:         Fri, 4 May 2007 16:02:11 +0000
Reply-To:     toby dunn <tobydunn@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         toby dunn <tobydunn@HOTMAIL.COM>
Subject:      Re: cumulative product?
Comments: To: datanull@gmail.com
In-Reply-To:  <7367b4e20705040856r680a74c0gfe5ff8fceed02b10@mail.gmail.com>
Content-Type: text/plain; format=flowed

Hmmm, I had thought of this but didnt like it based on the fact that it looked way more complicated, it forced newbies to know what the DoW is doing, it just took more lines of code, and well varcc = 1; is just artifical (ie. not part of the original data set) which adds a small but still one more complexity to the whole solution when one is reading it. POerhaps it is just me but I like my code to not only function as simply as possible but look simple as possible. But that is just me....

Toby Dunn

You can see a lot by just looking. ~Yogi Berra

Do not seek to follow in the footsteps of the wise. Seek what they sought. ~Matsuo Basho

You never know what is enough, until you know what is more than enough. ~William Blake, Proverbs of Hell

From: "data _null_;" <datanull@gmail.com> To: "toby dunn" <tobydunn@hotmail.com> CC: SAS-L@listserv.uga.edu Subject: Re: cumulative product? Date: Fri, 4 May 2007 11:56:50 -0400

Actually with the proper initialization of VARCC is it more straight forward.

data test2 ; varcc = 1; do until(last.varb); set test; by vara varb; varcc = varc * varcc; output; end; run;

On 5/4/07, toby dunn <tobydunn@hotmail.com> wrote: >Barry , > >Okay While I encourage you to read Pauls most excellent paper, I would also >say this is a bad example for the use of the DoW.... why you ask? Well >because it just creates more code than is neccessary. See Example below: > >Now One other thing before the example noone so far as I can tell has >actually made sure thet VarC was in the sort order of the data set, and it >makes a big difference in the final Cumulative value. > > > >Data Need ; >Set Have ; >By VarA VarB VarC ; >Retain CumVar ; > >If First.VarB Then CumVar = VarC ; >Else CumVar = CumVar * VarC ; > >Run ; > > > > > > >Toby Dunn > >You can see a lot by just looking. ~Yogi Berra > >Do not seek to follow in the footsteps of the wise. Seek what they sought. >~Matsuo Basho > >You never know what is enough, until you know what is more than enough. >~William Blake, Proverbs of Hell > > > > > >From: barry.debenham@TALK21.COM >Reply-To: barry.debenham@TALK21.COM >To: SAS-L@LISTSERV.UGA.EDU >Subject: Re: cumulative product? >Date: Fri, 4 May 2007 06:46:03 -0700 > >On 3 May, 12:41, Huang...@PRINCIPAL.COM ("Huang, JS") wrote: > > 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:S...@LISTSERV.UGA.EDU] On Behalf Of > > > > celia...@GMAIL.COM > > Sent: Thursday, May 03, 2007 6:20 AM > > To: S...@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 > > > > -----Message Disclaimer----- > > > > This e-mail message is intended only for the use of the individual or > > entity to which it is addressed, and may contain information that is > > privileged, confidential and exempt from disclosure under applicable >law. > > If you are not the intended recipient, any dissemination, distribution >or > > copying of this communication is strictly prohibited. If you have > > received this communication in error, please notify us immediately by > > reply email to Conn...@principal.com and delete or destroy all copies >of > > the original message and attachments thereto. Email sent to or from the > > Principal Financial Group or any of its member companies may be >retained > > as required by law or regulation. > > > > Nothing in this message is intended to constitute an Electronic >signature > > for purposes of the Uniform Electronic Transactions Act (UETA) or the > > Electronic Signatures in Global and National Commerce Act ("E-Sign") > > unless a specific statement to the contrary is included in this >message. > > > > While this communication may be used to promote or market a transaction > > or an idea that is discussed in the publication, it is intended to >provide > > general information about the subject matter covered and is provided >with > > the understanding that The Principal is not rendering legal, >accounting, > > or tax advice. It is not a marketed opinion and may not be used to >avoid > > penalties under the Internal Revenue Code. You should consult with > > appropriate counsel or other advisors on all matters pertaining to >legal, > > tax, or accounting obligations and requirements.- Hide quoted text - > > > > - Show quoted text > >Celia, > >I've been reading Paul Dorfmans paper "The Magnificent Do" and this >seems like a good place to use the 'DOW' loop described in that paper. >In essence the read (set) is carried out in an explicit do loop rather >than SAS's own implicit DO loop that reads in the data for you. The >paper explains this, and much more, with greater eloquence than I can >here. The following code will do as you ask however. > >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 >; >run; > >data test2 ; > varcc = 0; >do until(last.varb); > set test; > by vara varb; > if varcc eq 0 then varcc = varc; > else varcc = varc * varcc; > output; >end; >return; >stop; >run; > >the printed dataset looks like: > >Obs varcc VarA VarB VarC > > 1 3 a A 3 > 2 12 a A 4 > 3 60 a A 5 > 4 4 a B 4 > 5 20 a B 5 > 6 120 a B 6 > 7 840 a B 7 > 8 5 a C 5 > 9 6 a D 6 > 10 42 a D 7 > 11 4 b A 4 > 12 20 b A 5 > 13 120 b A 6 > 14 5 b B 5 > 15 30 b B 6 > 16 210 b B 7 > 17 1680 b B 8 > 18 6 b C 6 > 19 7 b D 7 > 20 56 b D 8 > >regards, > >Barry > >_________________________________________________________________ >Exercise your brain! Try Flexicon. >http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07 >

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