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Anne

2004-Dec-22 12:06 UTC

[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@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
--------------------------------------------------
 
	[[alternative HTML version deleted]]

Chuck Cleland

2004-Dec-22 12:13 UTC

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[R] ordering levels

testf <- ordered(testf, levels=c("red", "blue",
"white"))

?ordered

Anne wrote:> 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
> --------------------------------------------------
>  
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
> 
-- 
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 452-1424 (M, W, F)
fax: (917) 438-0894

BXC (Bendix Carstensen)

2004-Dec-22 12:24 UTC

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[R] ordering levels

In:

http://biostat.ku.dk/~bxc/SPE/library/

you will find a zip of the Lexis package that contains the
function Relevel, which has precise this (and other) features.

Bendix 
----------------------
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
> --------------------------------------------------
>  
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read 
> the posting guide! http://www.R-project.org/posting-guide.html
>

Achim Zeileis

2004-Dec-22 12:27 UTC

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[R] ordering levels

On Wed, 22 Dec 2004 13:06:02 +0100 Anne wrote:
> 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 
You can do

testf <- factor(as.character(testf), levels = c("red",
"blue", "white"))

or simply create testf with the right ordering of levels in the first
place.

hth,
Z
>  (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
> --------------------------------------------------
>  
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>

(Ted Harding)

2004-Dec-22 12:37 UTC

head link

[R] ordering levels

On 22-Dec-04 Anne wrote:> 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"...
Hi Anne,

Look at ?factor and note the default

   levels = sort(unique.default(x), na.last = TRUE)

in

   factor(x, levels = sort(unique.default(x), na.last = TRUE),
          labels = levels, exclude = NA, ordered = is.ordered(x))

You can change the order of levels by changing the "levels = ...",
as in
>
factor(c("1.2nd","2.1st","3.4th","4.3rd"))[1] 1.2nd 2.1st 3.4th 4.3rd
Levels: 1.2nd 2.1st 3.4th 4.3rd
>
factor(c("1.2nd","2.1st","3.4th","4.3rd"),        
levels=c("2.1st","1.2nd","4.3rd","3.4th"))
[1] 1.2nd 2.1st 3.4th 4.3rd
Levels: 2.1st 1.2nd 4.3rd 3.4th

Hoping this helps,
Ted.


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Date: 22-Dec-04                                       Time: 12:37:30
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