Sample Moments {HyperbolicDist} | R Documentation |
Computes the sample skewness and sample kurtosis.
skewness(x, na.rm = FALSE) kurtosis(x, na.rm = FALSE)
x |
A numeric vector containing the values whose skewness or kurtosis is to be computed. |
na.rm |
A logical value indicating whether NA values
should be stripped before the computation proceeds. |
If N = length(x), then the skewness of x is defined as
N^(-1) sd(x)^(-3) sum_i (x_i - mean(x))^3.
If N = length(x), then the kurtosis of x is defined as
N^(-1) sd(x)^(-4) sum_i (x_i - mean(x))^4 - 3.
The skewness or kurtosis of x
.
These functions and the description of them are taken from the
package e1071
. They are included to avoid having to require an
additional package.
Evgenia Dimitriadou, Kurt Hornik, Friedrich Leisch, David Meyer, and Andreas Weingessel
x <- rnorm(100) skewness(x) kurtosis(x)