[R] (no subject)

[Petr Pikal]

On 12 Jan 2005 at 15:17, nicolas.deig at epfl.ch wrote:

> 
> hi,
> 
> I am trying to grow a classification tree on some data, but I have a
> little problem. In order to do so I have to use a function like "tree"
> in R and on the internet help(tree) I get the following: 
> 
> "The left-hand-side (response) should be either a numerical vector
> when a regression tree will be fitted or a factor, when a
> classification tree is produced"
> 
> I would like to know what is a "factor" in R, is it numerical value
> with no formula or just a word??

Hi Nicolas

?factor will show you what it is.


Description:

     The function 'factor' is used to encode a vector as a factor (the
     terms 'category' and 'enumerated type' are also used for 
factors).
      If 'ordered' is 'TRUE', the factor levels are assumed to be
     ordered. For compatibility with S there is also a function
     'ordered'.

Cheers
Petr


> 
> Thanks in advance
> Nicolas
> 
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Petr Pikal
petr.pikal at precheza.cz