Gumbell distribution - minimum case

2 messages · Richard Gwozdz, Aaron Mackey

Original

Mon, Sep 8, 2008 2:22 PM #

Hello,

I would like to sample from a Gumbell (minimum) distribution.  I have 
installed package {evd} but the Gumbell functions there appear to refer 
to the maximum case.  Unfortunately, setting the scale parameter 
negative does not appear to work.

Is there a separate package for the Gumbell minimum?

_____________________________
Rich Gwozdz
Fire and Mountain Ecology Lab
College of Forest Resources
University of Washington
cell: 206-769-6808 
office: 206-543-9138
rgwozdz at u.washington.edu

Aaron Mackey

Tue, Sep 9, 2008 7:32 AM #

If you mean you want an EVD with a fat left tail (instead of a fat
right tail), then can;t you just multiply all the values by -1 to
"reverse" the distribution?  A new location parameter could then shift
the distribution wherever you want along the number line ...

-Aaron

On Mon, Sep 8, 2008 at 5:22 PM, Richard Gwozdz <rgwozdz at u.washington.edu> wrote:

_____________________________
Rich Gwozdz
Fire and Mountain Ecology Lab
College of Forest Resources
University of Washington
cell: 206-769-6808 office: 206-543-9138
rgwozdz at u.washington.edu

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