
Dear all,

Thank for your friendliness. 

I have read several documents and I'm sure that if I have time to read ALL documents in the world I would not need to be part of this list, because of my capabilities...

I have used this idea (factors) in several cases in which dummy variables arise, but I asked about the question because (in relation with my humility) I thought I had used the idea incorrectly. Nevertheless, I have noticed all I know is all I have to know about this question.

Regards.

Eva

--- El dom, 21/4/13, Rolf Turner <rolf.turner@xtra.co.nz> escribió:

De: Rolf Turner <rolf.turner@xtra.co.nz>
Asunto: Re: [R] creating dummy variables
Para: "Eva Prieto Castro" <evapcastro@yahoo.es>
CC: "r-help@R-project.org" <r-help@r-project.org>
Fecha: domingo, 21 de abril, 2013 03:16

On 21/04/13 10:56, Eva Prieto Castro wrote:
> Hi,
> 
> Why do you write that dummy variables are not needed in R?. I would like you explain it.

As others have said --- do some self-study.  But a brief answer is that in any
"reasonable" modelling problem in which dummy variables might arise, R creates
the dummy variables that it uses automagically , behind the scenes, from the *factors*
whose levels correspond to the dummy variables.

Summary:  Learn about and understand *factors*; forget about dummy
variables.

    cheers,

        Rolf Turner

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