Dear all I'm unable to find an example of extracting the rotated scores of a principal components analysis. I can do this easily for the un-rotated version.
data(mtcars) .PC <- princomp(~am+carb+cyl+disp+drat+gear+hp+mpg, cor=TRUE, data=mtcars) unclass(loadings(.PC)) # component loadings summary(.PC) # proportions of variance mtcars$PC1 <- .PC$scores[,1] # extract un-rotated scores of 1st principal component mtcars$PC2 <- .PC$scores[,2] # extract un-rotated scores of 2nd principal component head(mtcars[, c('PC1', 'PC2')]) However, I no longer understand how to do so if I want to use ?principal in 'psych' and any of the GPArotation methods. For example, require(psych) r <- cor(mtcars[,c("am","carb","cyl","disp","drat","gear","hp","mpg")]) pca <- principal(r, nfactors = 8, residuals = T, rotate="none") # or 'varimax' or any other GPArotation supported rotation pca I've turned the 'pca' object and ?principal help page upside down and I still cannot find anything that would resemble a 'scores' value. I'm pretty sure it's one matrix computation away, but I cannot find which one. Ideas? Thank you Liviu -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail ______________________________________________ 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.