<div dir="ltr"><div><div>As noted in the documentation: "The series must be at least 10 values." <br><br></div>I think that 5 < n < 10 necessitates a table-lookup which is currently not available from within NCL.<br><br></div>Sorry<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 20, 2016 at 9:55 AM, Aaron Spring <span dir="ltr"><<a href="mailto:aaron.spring@mpimet.mpg.de" target="_blank">aaron.spring@mpimet.mpg.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>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. <br>
</p>
<p>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?<br>
</p>
<p>The description of the trend_manken links to <a class="m_8372278309271302247moz-txt-link-freetext" href="http://vsp.pnnl.gov/help/Vsample/Design_Trend_Mann_Kendall.htm" target="_blank"></a><a class="m_8372278309271302247moz-txt-link-freetext" href="http://vsp.pnnl.gov/help/Vsample/Design_Trend_Mann_Kendall.htm" target="_blank">http://vsp.pnnl.gov/help/<wbr>Vsample/Design_Trend_Mann_<wbr>Kendall.htm</a>.
There it links to Gilberts 1987 book. <a class="m_8372278309271302247moz-txt-link-freetext" href="http://www.osti.gov/scitech/servlets/purl/7037501/" target="_blank"></a><a class="m_8372278309271302247moz-txt-link-freetext" href="http://www.osti.gov/scitech/servlets/purl/7037501/" target="_blank">http://www.osti.gov/scitech/<wbr>servlets/purl/7037501/</a>
p. 272 Table A18 shows probability tables for 5<n<10.</p>
<p>Has anyone faced the same problem or maybe already implemented
that?</p>
<p>Unfortunately, at my work station I cannot have a look into the
source code as I only see .a files.</p><span class="HOEnZb"><font color="#888888">
<br>
<pre class="m_8372278309271302247moz-signature" cols="72">--
Aaron Spring
Room 229
Max Planck Institute for Meteorology
Bundesstr. 53, 20146 Hamburg, Germany
<a class="m_8372278309271302247moz-txt-link-freetext" href="mailto:aaron.spring@mpimet.mpg.de" target="_blank">mailto:aaron.spring@mpimet.<wbr>mpg.de</a></pre>
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