[ncl-talk] Mann-Kendall test for n<10

[Dennis Shea]

As noted in the documentation: "The series must be at least 10 values."

I think that   5 < n < 10   necessitates a table-lookup which is currently
not available from within NCL.

Sorry

On Tue, Dec 20, 2016 at 9:55 AM, Aaron Spring <aaron.spring at mpimet.mpg.de>
wrote:

> I try to detect 5- to 10-year trends. I would like to use the Mann-Kendall
> test. This is included in NCL6.3.0.
>
> Unfortunately, I always get probability = 0 and trend = 0 if I use less
> than 10 data points for the test. Is there maybe a cut-off in the
> implementation?
>
> The description of the trend_manken links to
> <http://vsp.pnnl.gov/help/Vsample/Design_Trend_Mann_Kendall.htm>
> http://vsp.pnnl.gov/help/Vsample/Design_Trend_Mann_Kendall.htm. There it
> links to Gilberts 1987 book.
> <http://www.osti.gov/scitech/servlets/purl/7037501/>
> http://www.osti.gov/scitech/servlets/purl/7037501/ p. 272 Table A18 shows
> probability tables for 5<n<10.
>
> Has anyone faced the same problem or maybe already implemented that?
>
> Unfortunately, at my work station I cannot have a look into the source
> code as I only see .a files.
>
> --
> Aaron Spring
> Room 229
> Max Planck Institute for Meteorology
> Bundesstr. 53, 20146 Hamburg, Germany
> mailto:aaron.spring at mpimet.mpg.de <aaron.spring at mpimet.mpg.de>
>
>
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