timeDate (version 3043.102)

kurtosis: Kurtosis

Description

Functions to compute kurtosis.

Usage

kurtosis(x, ...)
# S3 method for default
kurtosis(x, na.rm = FALSE, method = c("excess", "moment", "fisher"), ...)
# S3 method for data.frame
kurtosis(x, ...)
# S3 method for POSIXct
kurtosis(x, ...)
# S3 method for POSIXlt
kurtosis(x, ...)

Value

kurtosis

returns the value of the statistics, a numeric value. An attribute which reports the used method is added.

Arguments

na.rm

a logical. Should missing values be removed?

method

a character string which specifies the method of computation. These are either "moment", "fisher", or "excess". If "excess" is selected, then the value of the kurtosis is computed by the "moment" method and a value of 3 will be subtracted. The "moment" method is based on the definitions of kurtosis for distributions; these forms should be used when resampling (bootstrap or jackknife). The "fisher" method correspond to the usual "unbiased" definition of sample variance, although in the case of kurtosis exact unbiasedness is not possible.

x

a numeric vector or object.

...

arguments to be passed.

See Also

link{skewness}.

Examples

## mean -
## var -
   # Mean, Variance:
   r = rnorm(100)
   mean(r)
   var(r)
   
## kurtosis - 
   kurtosis(r)   

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