Re: Algebraic sum

Scott Ferson (scott@ramas.com)
Sun, 14 Jun 1998 20:01:05 +0200 (MET DST)

> In article <1998060120310700.QAA20182@ladder01.news.aol.com>,
> wsiler@aol.com (WSiler) wrote:

> > ...so that the probabilistic OR may be expressed as
> >
> > A OR B = A + B - (A AND B)
> >
> > and are valid if the operands are statistically indepedent, that is
> have
> > zero correlation.

Sorry to quibble, but this mistake is dangerous enough that it
deserves correction every time it appears. Having zero correlation
does NOT generally guarantee probabilistic independence.

Scott Ferson <scott@ramas.com>
Applied Biomathematics, 516-751-4350, fax -3435

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