Re: [R] Discriminant function analysis

From: Birgit Lemcke <birgit.lemcke_at_systbot.uzh.ch>
Date: Thu, 7 Feb 2008 12:04:29 +0100

Am 06.02.2008 um 21:00 schrieb Tyler Smith:

> On 2008-02-06, Birgit Lemcke <birgit.lemcke@systbot.uzh.ch> wrote:
>>
>> I am using R 2.6.1 on a PowerBook G4.
>> I would like to perform a discriminant function analysis. I found lda
>> in MASS but as far as I understood, is it only working with
>> explanatory variables of the class factor.
>
> I think you are mistaken. If you reread the help for lda() you'll see
> that the grouping has to be a factor, but the explanatory variables
> should be numeric.

oh yeah your completely right. It seems that I had some tomatoes on my eyes.
>
>> My dataset contains variables of the classes factor and numeric. Is
>> there another function that is able to handle this?
>
> The numeric variables are fine. The factor variables may have to be
> recoded into dummy binary variables, I'm not sure if lda() will deal
> with them properly otherwise.

But aren´t binary variables also factors? Or is there another variable class than factor or numeric?
Do I have have to set the classe of the binaries as numeric?

Thanks for your help

Birgit
>
> HTH,
>
> Tyler
>
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Birgit Lemcke
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