Appropriate significant test (?)

Dear NCL,

I am normally using "ttest" function in NCL for calculating a significant
test for my composite. However, in one point I'm not really sure whether
what I've done is entirely correct or not.

Let's say I have two years daily data 2006-2007 of U [time, lat, lon], in
total I have 730 days for my data. Within this period, I have 25 selected
central dates varied within this period. My question is, how could I
perform a significant test so that this compositing event are statistically
significant at 95% level ?

Please share your expertise.
Thank you

-- AF

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Received on Wed Jan 15 08:23:51 2014