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From Phil Steitz <stei...@yahoo.com>
Subject Re: [math] [OT]UnivariateImpl - when sumsq ~ xbar*xbar*((double) n)
Date Wed, 04 Jun 2003 20:31:37 GMT

--- Al Chou <hotfusionman@yahoo.com> wrote:
> --- 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.
> 

Strangely, it's actually the recent stuff that is not available.  JSTOR has
American Statistician from 1947-1997.  If you want a chuckle, have a look at
http://www.jstor.org/about/movingwall.html, which explains the rationale for
this.

Phil

> 
> Al
> 
> =====
> Albert Davidson Chou
> 
>     Get answers to Mac questions at http://www.Mac-Mgrs.org/ .
> 
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