colkurtosis: Column-wise kurtosis and skewness coefficients

In Rfast: A Collection of Efficient and Extremely Fast R Functions

Column-wise kurtosis and skewness coefficients

Description

Column-wise kurtosis and skewness coefficients.

Usage

colkurtosis(x, pvalue = FALSE)

colskewness(x, pvalue = FALSE)

Arguments

x	A matrix with the data, where the rows denote the samples and the columns are the variables.
pvalue	If you want a hypothesis test that the skewness or kurtosis are significant set this to TRUE. This checks whether the skewness is significantly different from 0 and whether the kurtosis is significantly different from 3.

Details

The skewness and kurtosis coefficients are calculated. For the skewness coefficient we use the sample unbiased version of the standard deviation. For the kurtosis, we do not subtract 3.

Value

If "pvalue" is FALSE, a vector with the relevant coefficient. Otherwise a matrix with two columns. The kurtosis or skewness coefficient and the p-value from the hypothesis test that they are significantly different from 3 or 0 respectively.

Author(s)

Michail Tsagris

R implementation and documentation: Michail Tsagris <[e-mail]> and Manos Papadakis <[e-mail]>.

See Also

skew, skew.test2, colMedians, colmeans, colVars, sftests

Examples

## 200 variables, hence 200 F-tests will be performed
x = matrix( rnorm(200 * 50), ncol = 50 )
## 200 observations in total
colkurtosis(x)
colskewness(x)
x <- NULL

Rfast documentation built on Nov. 9, 2023, 5:06 p.m.