Dear All, when I'm running a PCA with
prcomp(USArrests, scale = TRUE) I get the right principal components, but with the wrong sign infront Rotation: PC1 PC2 PC3 PC4 Murder 0.5358995 -0.4181809 0.3412327 0.64922780 Assault 0.5831836 -0.1879856 0.2681484 -0.74340748 UrbanPop 0.2781909 0.8728062 0.3780158 0.13387773 Rape 0.5434321 0.1673186 -0.8177779 0.08902432 instead of PC1 PC2 PC3 PC4 Murder -0.5358995 0.4181809 -0.3412327 0.64922780 Assault -0.5831836 0.1879856 -0.2681484 -0.74340748 UrbanPop -0.2781909 -0.8728062 -0.3780158 0.13387773 Rape -0.5434321 -0.1673186 0.8177779 0.08902432 what is happening here? any ideas? thanks, René ______________________________________________ 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.
