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June 2003


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QingHua Wang <[log in to unmask]>
Reply To:
Classification, clustering, and phylogeny estimation
Wed, 25 Jun 2003 10:52:51 +0000
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Many thanks for your pointer. I will find whether there is such a book
in our library.

On Wed, 2003-06-25 at 07:53, Gilles CARAUX wrote:
> If prior probabilities are unknown, I suggest MinMax rule as described in Hand (1981) page 7.
> The Bayesian decision rule, in MinMax approach, is designed so that we minimize the maximum possible risk.
> Hand, D. J. (1981), Discrimination and Classification, John Wiley.
> A 21:29 23/06/2003, qhwang a écrit :
> >Hi folks,
> >
> >Can anyone explain me about how to determine the priori probabilities when Bayesian decision rule is applied, say, to classify a pattern into object class and non-object class? I know usually equal priori is assumed, but in this case how can the training set for both classes be interpreted? I mean, are these priori probabilities not necessarily derived from the training set since usually in which postive samples are not equal to negative samples?  Any help will be greatly appreciated.
> >
> >Many Thanks.