Re: ttest

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Mon Aug 01 2011 - 14:55:35 MDT

It is two-tailed t-test. It is not obvious but 'ttest'
uses the incomplete beta function (betainc) to calculate
the probability.

See Example 2 at

This illustrates how to get the one-tailed probability.
There is also a link where you can get the one and two tailed

Good luck

On 8/1/11 1:53 PM, Nicole Schiffer wrote:
> Does anyone know if the NCL ttest function performs a one- or two-tail
> t-test? If it is two-tail, the critical level of significance is split
> between the tails, correct?
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
Received on Mon Aug 1 14:55:40 2011

This archive was generated by hypermail 2.1.8 : Tue Aug 02 2011 - 14:31:37 MDT