Message-ID: <Pine.LNX.4.31.0211282254260.6131-100000@gannet.stats>
Date: 2002-11-28T23:00:27Z
From: Brian Ripley
Subject: big model on modest computer.
In-Reply-To: <200211291107.20032.lakeland@cs.otago.ac.nz>
On Fri, 29 Nov 2002, Corrin Lakeland wrote:
> On Fri, 29 Nov 2002 06:59, Ronaldo Reis Jr. wrote:
> > Hi,
> > I have a pentium III 600 with 128 ram running Linux.
>
> > I try this and fail. Memory problem.
>
> dd if=/dev/zero of=/tmp/tmpswap bs=1024 count=1000000
> mkswap /tmp/tmpswap
> swapon /tmp/tmpswap
>
> It will be _very_ slow, but it will work.
You know so? My calculations made this a 1.9Gb design matrix with more
columns than rows, so
(a) my guess is that you will hit the 4Gb/process address limit in i686
Linux and
(b) it won't `work' in any statistically meaningful way. That model fits
all products of 0 to 4 continuous variables in each cell of a 22*14*4
(from memory) contingency table.
I think it is the statistical strategy that needs to be thought through.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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