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From Al Chou <hotfusion...@yahoo.com>
Subject Re: [math] UnivariateImpl - when sumsq ~ xbar*xbar*((double) n)
Date Wed, 04 Jun 2003 16:59:42 GMT
--- Phil Steitz <phil@steitz.com> wrote:
> Al Chou wrote:
> > --- Phil Steitz <phil@steitz.com> 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.
> > 
> > 
> > Cool, thanks.  We can reference the original journal article, though I
> > personally would feel better if we had a copy of it so we could
> specifically
> > reference the equation number in it.  Anybody have easy access to a library
> > that carries "American Statistician"?
> > 
> I am in the process of renewing my ASA membership and getting set up to 
> access JSTOR, where I can snag this.  Will take a couple of days, but I 
> will chase this down.


OK, I hope the article we want is available online, given that it's pretty old.


Al

=====
Albert Davidson Chou

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