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...atrix. The absolute values, however, are the same. This sign difference also exists when comparing the princomp() results with the manually calculated eigen vectors using eigen(). Is this a bug in R? I am using R ver 1.5.1 Thanks in advance, Peter =========================================== Peter Vikstr?m Dept. of Economic History Ume? University SE-901 87 UME? E-mail: peter.vikstrom at ekhist.umu.se =========================================== -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.ht...