I was wrong about needing the Relevel from the Lexis package.
The default verson of relevel does the job of reshuffling levels
in any desired order, albeit with a warning (which comes from the
fact that apparently only a single number had been anticipated by
the designer):
> testf <- factor( sample( letters[1:4], 100, replace=T ) )
> table( testf, newf=relevel( testf, ref=c(3,2,1,4) ) )
newf
testf c b a d
a 0 0 21 0
b 0 21 0 0
c 32 0 0 0
d 0 0 0 26
Warning message:
the condition has length > 1 and only the first element will be used in:
if (is.na(ref)) stop("ref must be an existing level")
Bendix Carstensen
----------------------
Bendix Carstensen
Senior Statistician
Steno Diabetes Center
Niels Steensens Vej 2
DK-2820 Gentofte
Denmark
tel: +45 44 43 87 38
mob: +45 30 75 87 38
fax: +45 44 43 07 06
bxc at steno.dk
www.biostat.ku.dk/~bxc
----------------------
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Anne
> Sent: Wednesday, December 22, 2004 1:06 PM
> To: R list
> Subject: [R] ordering levels
>
>
> Hello!
> I would like to know if there is a simple way to reorder
> levels of a given factor.Let's say that the vector
>
testf<-factor(c("red","red","red","blue","blue","white"))
> levels(testf) : blue red white
>
> should have reordered levels such as
> levels(testf) : red blue white
>
> (this is for presentation purposes)
> I guess I'm looking for a generalized version of "relevel"...
>
> Thanks
>
> Anne
>
> ----------------------------------------------------
> Anne Piotet
> Tel: +41 79 359 83 32 (mobile)
> Email: anne.piotet at m-td.com
> ---------------------------------------------------
> M-TD Modelling and Technology Development
> PSE-C
> CH-1015 Lausanne
> Switzerland
> Tel: +41 21 693 83 98
> Fax: +41 21 646 41 33
> --------------------------------------------------
>
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>
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