[R] sdev, variance in prcomp

[carol white]

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