[ncl-talk] computing confidence interval from ttest

[Andrew Kren - NOAA Affiliate]

Thanks Dennis,
In general, can the ttest be run on anomaly correlations?

On Tue, Apr 4, 2017 at 2:01 PM, Dennis Shea <shea at ucar.edu> wrote:

> Has anybody answered your question?
>
> http://www.itl.nist.gov/div898/handbook/eda/section3/eda352.htm
> See the definition of the confidene interval.
>
>    tval_opt =True                                 ; p & t-value
>    pt          = ttest(aveX,varX,sX, aveY,varY,sY, iflag, tval_opt)
>    print(pt)
>
> The 2nd element is the t-value
>
> HTH
>
>
>
>
>
> On Fri, Mar 31, 2017 at 3:49 PM, Andrew Kren - NOAA Affiliate <
> andrew.kren at noaa.gov> wrote:
>
>> Dear ncl-talk,
>>
>> I'm using the function ttest in NCL to compute the two-tailed
>> significance of a set of correlations. I plot the correlations (anomaly) as
>> a time series as most people do. I compute the difference between the two
>> and want to also plot an envelope that encompasses the 95% confidence range
>> for the range of values. Is there a way to determine this from the ttest?
>>
>> --
>> Andrew Kren, PhD
>> Research Scientist I, Global Observing Systems Analysis (GOSA) Group
>> NOAA ESRL Global Systems Division (Rm 3C515)
>> 325 Broadway, Boulder, CO 80305
>> (303) 497-5418
>>
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>>
>


-- 
Andrew Kren, PhD
Research Scientist I, Global Observing Systems Analysis (GOSA) Group
NOAA ESRL Global Systems Division (Rm 3C515)
325 Broadway, Boulder, CO 80305
(303) 497-5418
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