Re: estimating gamma distribution parameters

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Tue Apr 20 2010 - 11:02:34 MDT

To my knowledge the answer is "no".

An NCL "gamfit" would be a nice function to have but NCL does not
have a built-in equivalent.

??? Volunteers to create an NCL 'gamfit' ??????

---
I am sure you are aware of:
http://www.ncl.ucar.edu/Document/Functions/Built-in/cdfgam_p.shtml
http://www.ncl.ucar.edu/Document/Functions/Built-in/cdfgam_x.shtml
These are functionally the same as Matlab's "gamcdf" and "gaminv".
[Actually, the last argument of NCL's "cdfgam_p" &  "cdfgam_x" needs
  to be inverted.]
On 04/19/2010 04:27 PM, Rob Nicholas wrote:
> Hi NCLers,
>
> Has anyone used NCL to calculate maximum likelihood estimates of the
> gamma distribution shape and scale parameters?  Although NCL has a
> number of built-in functions related to gamma distributions, it
> doesn't seem to have anything equivalent to the Matlab/Octave 'gamfit'
> function.  Any code or wisdom that others can share would be much
> appreciated.
>
> ~Rob
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Dennis J. Shea                  tel: 303-497-1361    |
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Climate Analysis Section                             |
Climate & Global Dynamics Div.                       |
National Center for Atmospheric Research             |
Boulder, CO  80307                                   |
USA                        email: shea 'at' ucar.edu |
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Received on Tue Apr 20 11:03:08 2010

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