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

[Aaron Spring]

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. There it
links to Gilberts 1987 book.
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

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