R is for dummies (like me, but I don't use dummy variables) or for the
non-Dummies like all experts who help us all the time@@.. so dummy
variables are not needed! :)
QED...


On Sat, Apr 20, 2013 at 6:16 PM, Rolf Turner <rolf.turner@xtra.co.nz> wrote:

> 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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