Date:         Thu, 30 Sep 2010 09:48:00 -0400
Reply-To:     Michael Raithel <michaelraithel@WESTAT.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Michael Raithel <michaelraithel@WESTAT.COM>
Subject:      Re: IN= variables, End= variables
In-Reply-To:  <AANLkTikeUPjYPEyXstXejg2BOm4QPGpg7UkuJeoiBBxC@mail.gmail.com>
Content-Type: text/plain; charset="us-ascii"

Dear SAS-L-ers,

Joe posted the following:

> I'm a bit curious, as someone who knows how to program in SAS but
> didn't
> learn the book way so doesn't know terminology.  What does PDV really
> exactly mean?  To me, it would mean path from the variables in the code
> and
> input dataset to the output dataset.  Then, automatic variables [eg
> _N_, in=
> variables, etc.] wouldn't really be in the "PDV" since they are not
> getting
> written out...  Does PDV actually mean the internal temporary memory
> structure that exists in between the code/input data and the output
> data?
>
Joe, good questions!  I think that the best explanations/descriptions of the PDV that I have read are on these two web page from the SAS 9.2 Language Reference: Concepts, Second Edition:

http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#a000985872.htm

...and:

http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#a000961108.htm

I'm sure that the other SAS-L brainiacs will chime in with their own recommendations, but those two are the cat's meow for me!

Joe, best of luck in all your SAS endeavors!


I hope that this suggestion proves helpful now, and in the future!

Of course, all of these opinions and insights are my own, and do not reflect those of my organization or my associates. All SAS code and/or methodologies specified in this posting are for illustrative purposes only and no warranty is stated or implied as to their accuracy or applicability. People deciding to use information in this posting do so at their own risk.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Michael A. Raithel
"The man who wrote the book on performance"
E-mail: MichaelRaithel@westat.com

Author: Tuning SAS Applications in the MVS Environment

Author: Tuning SAS Applications in the OS/390 and z/OS Environments, Second Edition
http://www.sas.com/apps/pubscat/bookdetails.jsp?catid=1&pc=58172

Author: The Complete Guide to SAS Indexes
http://www.sas.com/apps/pubscat/bookdetails.jsp?catid=1&pc=60409

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
If the rain comes they run and hide their heads.
They might as well be dead.
If the rain comes, if the rain comes. - The Beatles, Rain
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