Re: [R] Fisher's discriminant functions

From: Leonardo Lami <lami_at_faunalia.it>
Date: Wed 05 Oct 2005 - 18:06:34 EST

Hi,
I have the same problem.
I found a solution but I think there is something of more simple and correct.

I take a group and I put 0 the values of the other group, after I use the function "glm" to abtain the Fisher's discriminant function for this group. I repeat the same for all the groups.

Some times ago i try to make the same query but without results.

Best wishes
Leonardo

Alle 22:22, giovedý 29 settembre 2005, Kjetil Holuerson ha scritto:
> This are in various packages, you could have a look at
> ade4 (on CRAN).
>
> Kjetil
>
> C NL wrote:
> > Hi everyone,
> >
> > I'm trying to solve a problem about how to get the
> > Fisher's discriminant functions of a "lda" (linear
> > discriminant analysis) object, I mean, the object
> > obtained from doing "lda(formula, data)" function of
> > the package MASS in R-project. This object gives me
> > the canonical linear functions (n-1 coefficients
> > matrix of n groups at least), and only with this
> > information I could predict the group of an
> > observation data using the "predict" function. But
> > what I need is the Fisher's discriminant functions (n
> > coefficients matrix of n groups) in order to classify
> > my future data.
> >
> > The object "predict" gives me only the following
> > attributes "x", "posterior" and "class", but none of
> > them are the coefficients matrix of the Fisher's
> > discriminant functions, and the reason why I'm not
> > using the "predict" function for my predictions is
> > because the time spent is very high for what I'm
> > expecting, about 0.5 seconds while I can obtain this
> > prediction with the Fisher's discriminant functions
> > faster.
> >
> > So, I don't know if there's a package which I can
> > use to obtain the mentioned coefficients matrix of the
> > Fisher's discriminant functions.
> >
> > I anyone can help, I would appreciate it greatly.
> >
> > Thank you and regards.
> >
> > Carlos Niharra Lˇpez
> >
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-- 
Leonardo Lami
lami@faunalia.it            www.faunalia.it
Via Colombo 3 - 51010 Massa e Cozzile (PT), Italy   Tel: (+39)349-1310164
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Received on Wed Oct 05 18:13:52 2005

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