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big model on modest computer.

4 messages · Ronaldo Reis Jr., Corrin Lakeland, Peter Dalgaard +1 more

Original
Ronaldo Reis Jr.
# 
Hi,
I have a pentium III 600 with 128 ram running Linux.

I have a dataset with this variables in 12000 lines.

coleta = response (count data)
data = continuous data
latitude = continuous data
longitude = continuous data
variedade = categorical with 14 levels
solo = categorical with 22 levels
idade = continuous data
app = categorical with 4 levels

I want to test several models beginning by the full model.

coleta~data*latitude*longitude*variedade*solo*idade*app

Is possible to run this model in my computer? I try this and fail. Memory 
problem.

Thanks
Ronaldo
Corrin Lakeland
# 
-----BEGIN PGP SIGNED MESSAGE-----
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On Fri, 29 Nov 2002 06:59, Ronaldo Reis Jr. wrote:
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.

Corrin
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Peter Dalgaard
# 
Corrin Lakeland <lakeland at cs.otago.ac.nz> writes:
... provided Ronaldo has 1GB of free diskspace in /tmp !
Brian Ripley
#
On Fri, 29 Nov 2002, Corrin Lakeland wrote:

            

      
      
      
    

        
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.