Re: data set

If you tried the link below
    http://www.esrl.noaa.gov/psd/data/gridded/data.gpcc.html

and you are using the following:
    f = addfile("precip.mon.1981-2010.ltm.v6(1).nc","r")

then the dim_spi_n function will likely return spurious results.

===
*As was noted in a previous email*, using a climatology
(12 months only), *will not work*.

****dim_spi_n is fitting a distribution***
12 values will *not* yield a valid sample size for the distribution..
As noted in the dim_spi_n documentation, the function needs
a large (say 30 years; 30*12=360) to work properly.

Further, you are using len = (/3,6,12,24/)
You can *NOT* do that. 24 is twice as long as the available data.
+++++++++++++++++++++++++

Same web site:
                precip.mon.total.2.5x.25.v6.nc

+++++++++++++++++++++++++
As noted by another poster, it is *your* job to find the data sets.
ncl-talk is for question about the NCL only.

You were provided a URL about climate data.
Please use the following to look for data (Search: precipitation).

http://climatedataguide.ucar.edu/

On 7/31/13 2:05 PM, Setareh Rahimi wrote:
> Dear all,
>
> I am trying to calculate standardized precipitation index (SPI). Would you
> please advice me a total monthly global precipitation data set which is
> suitable for this purpose? I have tried data from the following link so do
> not suggest it.
> http://www.esrl.noaa.gov/psd/data/gridded/data.gpcc.html
>
>
> Thank you in advanve
>
>
>
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Received on Wed Jul 31 16:35:58 2013