On Tue, 2003-09-23 at 16:00, Ken Williams wrote:
>  On Tuesday, September 23, 2003, at 02:21  AM, Dominique Vlieghe wrote:
>  
>  > Hi,
>  >
>  > I was wondering whether the NaiveBayes Modules (AI::NaiveBayes1 and
>  > Algorithm::NaiveBayes) are capable of handling numerical attributes. A
>  > first glance on the code tells me they are not. Is this so and if yes,
>  > does anyone have an alternative package? Are there any plans to
>  > introduce numerical attributes in the modules?
>  
>  Algorithm::NaiveBayes uses numerical attributes:
>  
>     $nb->add_instance
>       (attributes => {foo => 1.7, bar => 3.234},
>        label => 'whatever');
>  
>  Or do I misunderstand your question?

I think you do, what I mean is that it should create some sort of
distribution (e.g. a normal distribution) of the values of a given
attribute. The naive bayes modules will (if I'm not mistaken) count the
number of occurrences of a (numeric or not) attribute e.g. in your
example you will have 1 times 1.7 and 1 times 3.234.

In weka for example the nature of the attribute is determined by the
input file: either discrete or numeric.

-- 
------------------------------
Dominique Vlieghe, Ph.D.,
Bioinformatics Core,
Department for Molecular Biomedical Research (DMBR)
VIB - Ghent University
(new) 'Fiers-Schell-Van Montagu' building
(new) Technologiepark 927
(new) B-9052 Ghent (Zwijnaarde), Belgium

(new) Tel : +32-(0)9-33-13.693
(new) Fax : +32-(0)9-33-13.609
(new) email:dominique.vlieghe@[...].be
(new) www:http://www.dmbr.ugent.be/
------------------------------