[ncl-talk] t-test

[Dennis Shea]

It is unlikely that a person will read a scientific paper to answer an
ncl-talk  question:

       *"*
*How author has calculated 0.79?"*
https://www.ncl.ucar.edu/Document/Functions/Built-in/ttest.shtml

performs a two-tailed t-test.

Also,

https://www.ncl.ucar.edu/Document/Functions/Built-in/betainc.shtml
See Example 2

===
one sided:
   https://www.ncl.ucar.edu/Document/Functions/Built-in/cdft_p.shtml
   https://www.ncl.ucar.edu/Document/Functions/Built-in/cdft_t.shtml


On Thu, Aug 9, 2018 at 12:08 AM, Morteza Qadimi <mqadimi at yahoo.com> wrote:

> Hi,
>
> I need to separate CP and EP El Niño years by the method used in a paper (*A
> new method to classify ENSO events into eastern and central Pacific types)*.
> I have obtained an (1D) EOF-based pattern correlation coefficient array
> (say EPC1). Then the author says:
>
> " The EP type El Niño is defined as the case when the EPC1 index is equal
> to or greater than 0.79 which is significant at the 90% confidence level
> from the two-tailed Student’s t-test."
>
> How author has calculated 0.79? Does NCL has a function for that? It has
> been 2 weeks i am asking for a solution. please help me.
>
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