# [ncl-talk] Probability calculation

Dennis Shea shea at ucar.edu
Tue May 26 16:45:24 MDT 2015

```'prob' is the probability

Well, what is 'prob1' ?

On Tue, May 26, 2015 at 2:58 PM, Sunmin Park <mireiyue at gmail.com> wrote:

> Dear NCL users
>
> I am trying to get rtest and ttest values from cross correlation lag 0.
> ESCORC was used to calculate cross correlation and I did rtest first then
> ttest using the equation from here
> https://www.ncl.ucar.edu/Document/Functions/Built-in/rtest.shtml.
> However, the ttest value are not correct when I printout Min Max values
> (min=0   max=805.891).
>
> How I can fix this?
>
> Here is script I used to calculate.
>
> massvsext1 = escorc(CMF3,EXT)                   ; calc cross correlations
> printVarSummary(massvsext)
>
> Nr = dimsizes(CMF3&time)
>
> prob = rtest(massvsext,Nr,0)
> probt = prob1*sqrt((Nr-2)/(1-prob1^2))
>
> probt!0 = "lat"
> probt!1 = "lon"
> lat = fspan(-90,90,180)
> lon = fspan(-180,180,360)
> probt&lat = lat
> probt&lon = lon
> lat at longname = "latitude"
> probt&lat at units = "degrees_north"
> lon at longname ="longitude"
> probt&lon at units = "degrees_east"
>
> printVarSummary(probt)
> printMinMax(probt,0)
>
> Thank you for helps and comments.
> Sun-
>
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