Re: [R] slow computation of mixed ANOVA using aov

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Sat 19 Mar 2005 - 21:35:57 EST

Peter Dalgaard <p.dalgaard@biostat.ku.dk> writes:

> - use a version of R compiled with a fast BLAS, on a fast computer

> with a lot of RAM... (A ~2K square matrix inversion will take a
> while, but "hours" sounds a bit excessive).

To wit:

> system.time(aov(dv~f1*f2*f3+Error(subject/(f1+f3)),data=d))
[1] 582.46 9.31 619.01 0.00 0.00

i.e. about 10 minutes on an Opteron 240 (dual, but it only seemed to use one cpu for this task) with 1GB.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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Received on Sat Mar 19 21:46:10 2005

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