[R] Change class factor to numeric

[Petr Pikal]

Hi

On 6 May 2005 at 8:51, Paulo Justiniano Ribeiro Jr wrote:

> as.numeric()

Not exactly correct.

as.numeric(as.character())

gives you what you probably want ,if "mass" is really factor ;)

see

str(mass)

Cheers
Petr


> 
> 
> 
> On Fri, 6 May 2005, Smit, R. (Robin) (IenT) wrote:
> 
> > I am attempting to develop a multiple regression model using
> > selected model variables that should all be treated as numeric
> > (mostly real) values. However, R considers one specific variable
> > "mass" automatically to be of class "factor", probably because
> > "mass" consists of integer values that are repeated. I now want to
> > force R to treat "mass" as a numeric variable in the regression but
> > am not sure how to do this.
> >
> > > class(mass) <- "numeric"
> >
> > does not help me.
> >
> > Could anyone advise me on this?
> >
> > Kind regards,
> > Robin Smit
> >
> >
> > --------------------------------------------
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> > Business Unit Automotive
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> 
> Paulo Justiniano Ribeiro Jr
> LEG (Laboratório de Estatística e Geoinformaçăo)
> Departamento de Estatística
> Universidade Federal do Paraná
> Caixa Postal 19.081
> CEP 81.531-990
> Curitiba, PR  -  Brasil
> Tel: (+55) 41 361 3573
> Fax: (+55) 41 361 3141
> e-mail: paulojus at est.ufpr.br
> http://www.est.ufpr.br/~paulojus
> 
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Petr Pikal
petr.pikal at precheza.cz