A summation in R software -


i need work out summation
(xi-m)^3

  • i takes values 1 25
  • xi elements of vector x
  • m mean of vector x

is following code correct? 

s<-sum((xi-m)^3)

some data first:

set.seed(1) x = rnorm(100, 20, 3)

instead of using x - mean(x), can use scale, avoiding divide standard deviation using scale=f argument:

sum(scale(x[1:25], scale=f)^3)  #> sum((x[1:25]-mean(x[1:25]))^3)==sum(scale(x[1:25], scale=f)^3) #[1] true

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