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From "Mark R. Diggory" <mdigg...@latte.harvard.edu>
Subject Re: [math] UnivariateImpl - when sumsq ~ xbar*xbar*((double) n)
Date Tue, 03 Jun 2003 15:08:27 GMT
Phil Steitz wrote:

> Al Chou wrote:
>
>> Uh, did we drop the idea of using the "corrected two-pass" algorithm 
>> for the
>> variance in the non-rolling case?  I excerpted that thread below.
>
>
> I was going to mention that.  The discussion above regards the 
> "non-stored vector" approach (UnivariateImpl).  I submitted some 
> patches to the "stored" classes 
> (StoredUnivariate,AbstractStoreUnivariate) last weekend (adding 
> percentiles -- 
> http://issues.apache.org/bugzilla/show_bug.cgi?id=20377) and I was 
> waiting for them to get committed before suggesting this 
> change/submitting the patch.
>
> Given our recent NR entanglements, we need to make sure that if and 
> when we apply that patch we document using the original source of the 
> formula.
>
> Thanks for the remider.
>
> What is relevant to the UnivariateImpl computations is Brent's 
> suggestion re: making "running" error corrections.  Have you 
> investigated this further? 


I'll pick up this patch and apply it before any of my changes to 
UnivariateImpl. Thanks for redirecting my attention to it, I'm still 
getting used to going into bugzilla.

-Mark




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