[R] sdev, variance in prcomp

carol white wht_crl at yahoo.com
Mon Apr 9 22:31:44 CEST 2012

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?



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