Date: Mon, 29 Jan 2007 01:16:28 -0800
Reply-To: Albert-jan Roskam <fomcl@YAHOO.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Albert-jan Roskam <fomcl@YAHOO.COM>
Subject: Re: SAS code to shut down windows
In-Reply-To: <BAY103-F40ABD699B904E5E8098A6BB0A70@phx.gbl>
Content-Type: text/plain; charset=iso-8859-1
Hi list,
Thank you *all* for your advice! I greatly appreciate
this.
David, you suggested looking at the problem of slow
calculations 'upstream'. Well, in my case I was using
a macro to calculate prevalence rate ratios:
Deddens JA, Petersen MR, Lei X. Estimation of
prevalence ratios when PROC GENMOD does not converge.
Proceedings of the 28th Annual SAS Users Group
International Conference, Seattle, Washington, March
30–April 2, 2003. (Paper 270-28).
(http://www2.sas.com/proceedings/sugi28/270-28.pdf).
The log-binomial approach for calculating PRRs is
known for its numerical instability, hence the COPY
method:
"This method consists of expanding the original data
set to include a large number of copies of the
original data set together with one copy of the
original data set with cases and controls reversed.
The estimated standard error of the prevalence ratio
on the expanded data set is then "adjusted" to obtain
the correct estimate of the standard error of the
prevalence ratio."
So although you're basically right David, in this case
it's hard to by-pass the computer's slowness.
Cheers!
Albert-Jan
--- David L Cassell <davidlcassell@MSN.COM> wrote:
> fomcl@YAHOO.COM wrote:
> >
> >hi list,
> >
> >Some analyses I do are so time-consuming that I
> leave
> >my computer on overnight. I was just wondering
> whether
> >some 'green' approach is possible: SAS code to shut
> >down windows after the SAS job is done, and save
> >electricity, trees, and what have you. I've been
> >looking for such a piece of code but with no
> success.
> >
> >Does anybody know how to do this?
> >
> >Thanks in advance!
> >
> >Albert-Jan
>
> I see that you have already received some good
> advice on this.
> Let me offer something else. :-)
>
> If you really want to 'go green', perhaps it would
> be better
> to focus on the upstream problem. Why are your
> analyses
> taking so long to run? What are you computing? Are
> there
> faster alternatives which would reduce the need to
> leave your
> computer running overnight?
>
> HTH,
> David
> --
> David L. Cassell
> mathematical statistician
> Design Pathways
> 3115 NW Norwood Pl.
> Corvallis OR 97330
>
>
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