nsRFA (version 0.3-0)

moments: Sample moments

Description

moments provides the estimate of the first 4 moment-statistics of a sample.

Usage

moments (x)
 CV (x)
 skew (x)
 kurt (x)

Arguments

x

vector representing a data-sample

Details

Skewness and kurtosis are defined as: $$skew = n^(-1) sd(x)^(-3) sum_i (x_i - mean(x))^3$$ $$kurt = n^(-1) sd(x)^(-4) sum_i (x_i - mean(x))^4 - 3$$ where $n$ is the size of x.

See Also

mean, var, sd, Lmoments.

Examples

x <- rnorm(30,10,2)
moments(x)

data(hydroSIMN)
x <- annualflows["dato"][,]
cod <- annualflows["cod"][,]
sapply(split(x,cod),moments)