Gumbel distribution maximum likelihood estimation

Uses Newton-Raphson to estimate the parameters of the Gumbel distribution.

Usage

mlgumbel(x, na.rm = FALSE, ...)

Arguments

x: a (non-empty) numeric vector of data values.
na.rm: logical. Should missing values be removed?
...: sigma0 is an optional starting value defaulting to 1. reltol is the relative accuracy requested, defaults to .Machine$double.eps^0.25. iterlim is a positive integer specifying the maximum number of iterations to be performed before the program is terminated (defaults to 100).

Value

mlgumbel returns an object of class univariateML. This is a named numeric vector with maximum likelihood estimates for mu and s and the following attributes:

model: The name of the model.
density: The density associated with the estimates.
logLik: The loglikelihood at the maximum.
support: The support of the density.
n: The number of observations.
call: The call as captured my match.call

shape and sigma.

Details

For the density function of the Gumbel distribution see Gumbel.

References

Johnson, N. L., Kotz, S. and Balakrishnan, N. (1995) Continuous Univariate Distributions, Volume 2, Chapter 22. Wiley, New York.

Examples

mlgumbel(precip)
#> Maximum likelihood estimates for the Gumbel model 
#>    mu  sigma  
#> 27.89  13.76