Hi,
Just learned another way to calculate sd for a frequency distribution
matrix:
> p <- matrix(c(10,3,20,4,30,5),ncol=2,byrow=TRUE)
> p
[,1] [,2]
[1,] 10 3
[2,] 20 4
[3,] 30 5
> rep(p[,1],p[,2])
[1] 10 10 10 20 20 20 20 30 30 30 30 30
> sd(rep(p[,1],p[,2]))
[1] 8.348471
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