[ncl-talk] problem of gamma fit and cumulative probability functions
Dennis Shea
shea at ucar.edu
Tue Aug 11 05:01:06 MDT 2015
The codes used by NCL will be sent.
The documentation issue will be looked at.
Regards
On Mon, Aug 10, 2015 at 8:26 PM, Xin Zhou <xinzhou.sys at gmail.com> wrote:
> Dear NCL users,
>
> I'm twisting the SPI formula since the build in function dim_spi_n() does
> not meet my needs. I meet a problem of gamma fit and cumulative probability.
>
> The cumulative probability of gamma distribution that I calculated
> (cdfgam_p) based on the output of gamma fit (dim_gamfit_n) does not make
> sense. I suspect that the online documentations of these two functions are
> not consistent, and the "shape" parameter in one function probably means
> "1/shape" in another function. Has anybody run into the same problem?
>
> Also, does anyone know where is the source code of dim_spi_n? My calculation
> of SPI does not match the output of dim_spi_n exactly, although the
> distribution seems reasonable.
>
> Thank you,
> Xin
>
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