It is reporting _proportion_ of the total variance. Not the variance. The total variance is the sum of all the squared standard deviations. Only the first 3 standard deviations are shown.
Kevin On Mon, Apr 9, 2012 at 3:31 PM, carol white <wht_...@yahoo.com> wrote: > Hello, > It might be a trivial question but I just wanted to find out the > relationship between sdev and proportion of variance generated by prcomp. I > got the following result from my data set > > PC1 PC2 PC3 > Standard deviation 104.89454 15.40910 9.012047 > Proportion of Variance 0.52344 0.01130 0.003860 > Cumulative Proportion 0.52344 0.53474 0.538600 > > > > first, I had thought that the variance must be standard deviation power to > 2 but it seems that variance is sdev/200. Did I misunderstood some thing? > > Best, > > Carol > > > ______________________________________________ > 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. > -- Kevin Wright [[alternative HTML version deleted]] ______________________________________________ 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.
