[SciPy-Dev] Independent T-tests with unequal variances

Junkshops junkshops@gmail....
Mon Apr 30 20:11:47 CDT 2012

Well, this is embarrassing. I appear to have sent the wrong diff with a 
sign error in it. The correct one is attached.

My apologies,


On 4/30/2012 5:12 PM, Junkshops wrote:
> Hello all,
> I hope, as an utter newb poking my nose into this list, that I'm not 
> giving the author of Miss Manner's Book of Netiquette the vapours.
> This is a follow up to Deniz Turgut's recent email: 
> http://article.gmane.org/gmane.comp.python.scientific.devel/16291/
> "There is also a form of t-test for independent samples with different 
> variances, also known as Welch's t-test [2]. I think it is better to 
> include the 'identical variance' assumption in the doc to avoid 
> confusion."
> I was just caught by this problem and heartily agree with Deniz's 
> views. However, I didn't see any explicit plans to add Welch's test to 
> scipy/stats/stats.py, and I needed an implementation of the test and 
> so implemented it. A diff against scipy 0.10.1 is attached if anyone 
> might find it useful.
> Cheers,
> Gavin
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