[R] How to change the levels of a variable???

[Frank E Harrell Jr]

Another way to do this is as follows:

> x <- factor(letters)
> levels(x) <- list(ab=c('a','b'),cd=c('c','d'))
> x
 [1] ab ab cd cd e  f  g  h  i  j  k  l  m  n  o  p  q  r  s  t  u  v 
w  x  y
[26] z
Levels:  ab cd e f g h i j k l m n o p q r s t u v w x y z

Frank Harrell


John Fox wrote:
> 
> At 08:27 AM 21/09/2001 -0300, Ronaldo Reis Jr. wrote:
> >Hi,
> >
> >I have a simple question.
> >
> >I have a variable with 3 levels.
> >
> >Variable
> >A A A A A A
> >B B B B B B
> >C C C C C C
> >
> >I need to make a new vector renaming de levels B and C for D.
> >
> >NewVariable
> >A A A A A A
> >D D D D D D
> >D D D D D D
> >
> >I dont find how to make it in manuals or in this list.
> >Can anyone help-me???
> >Thank you
> >Ronaldo
> >--
> 
> Dear Ronaldo,
> 
> There are several ways to do this; one way is to use the recode function in
> the car package:
> 
>      new <- recode(var, " c('B', 'C') = 'D' ")
> 
> I hope that this helps,
>   John
> 
> -----------------------------------------------------
> John Fox
> Department of Sociology
> McMaster University
> Hamilton, Ontario, Canada L8S 4M4
> email: jfox at mcmaster.ca
> phone: 905-525-9140x23604
> web: www.socsci.mcmaster.ca/jfox
> -----------------------------------------------------
> 
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-- 
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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