test$scores gives you the principal components for princomp For factanal, you specify eg : test <- factanal(USArrests,1,scores="regression") test$scores
see ?factanal regarding the variance : the "variance" you see is coming from the SS loadings, which is the Sum of Squared loadings. This divided by the number of variables (which equals the number of loadings) gives you the proportion var. this is NOT the proportion of the variance of the original data that gets explained. In the princomp, it doesn't even make sense as the SS loadings is bound to be 1, always. It is just displayed as the print function for the loadings comes from the factor analysis. There the SS loadings is supposed to be the eigenvalue or latent root associated with that factor. Most of this info is available in the help files btw. Cheers Joris On Thu, May 6, 2010 at 5:21 PM, Bunny, lautloscrew.com < bu...@lautloscrew.com> wrote: > Dear all, > > i wonder if there´s a command to obtain the actual values of a principal > component or a factor (not as.factor, but factanal) . > > > test=princomp(USArrests, cor = TRUE) > summary(test) > > just outputs, standard deviation, Prop of Variance and cumulative > proportion of variance. > > test$loadings offers yet another proportion of variance scheme. why is > that? > > Apart from that: the "variance" you see is calculated from the SS loadings, > being - if I read it right - the sum of squared loadings. > > Is there a possibily to get the component itself, i mean the linear > combination that represents it vor each observation ? (Loading_i * > variable_variable_i) > > thx in advance, best regards > > matt > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Joris Meys Statistical Consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control Coupure Links 653 B-9000 Gent tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php [[alternative HTML version deleted]]
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