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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --27464147-1968795515-1164715405=:5670 Content-Type: TEXT/PLAIN; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8BIT You need to re-install packages when you update R, as it says in the rw-FAQ. Use update.packages(checkBuilt=TRUE) to

Hi R People: When performing PCA, should I use prcomp, princomp or fast.prcomp, please? thanks. Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: erinm.hodgess at gmail.com

...page: "Principal Components Analysis (PCA) is available in prcomp() (preferred) and princomp() in standard package stats." There are also - at least - FactoMineR, psych and ade4 that provide PCA funtions. I imagine that it would much depend on what you want to do. Liviu [1] http://cran.miscellaneousmirror.org/src/contrib/Views/Environmetrics.htm l [2] http://cran.r-project.org/src/contrib/Views/Psychometrics.html ------------------------------ Message: 34 Date: Sun, 10 Feb 2008 19:40:53 -0200 From: "Henrique Dallazuanna" <wwwhsd at gmail.com> Subject: Re: [R] Applying lm to data...