R help - Aug 2011 - Renaming levels of a factor in a dataframe

Dear Helplist:

 

I am trying, unsuccessfully, to rename levels of a factor in a dataframe. The
dataframe consists of two factor variables and one numeric variable as follows:

Factor Site has 2 levels AB and DE, factor Fish has 30 levels, 15 associated
with each Site e.g. 1-1, 1-2,.....2-1, 2-2....  I am trying to rename the levels
of factor Site from AB to Fw and DE to Est while keeping them as factors.  The
following 2 approaches do not work, each giving a NULL response and creating a
character string.

 

levels (Data1$Site <- c("Fw", "Est"))  This simply gives
an alternating list of Fw, Est, Fw, Est... not the desired 15 concurrent rows of
Fw followed by 15 of Est.

 

#levels (Data1$Site <- list(Fw = "AB", Est = "DE")) This
gives the same result.  I have tried other approaches to no avail.  It seems a
simple problem but has not been so.

 

Any suggestions for solving this problem would be much appreciated.

 

Regards,

BJ

Here's an example of relevel used to relevel and combine groups....
 
InsectSprays2<-InsectSprays
levels(InsectSprays2$spray)
levels(InsectSprays2$spray)<-list(new1=c("A","C"),YEPS=c("B","D","E"),LASTLY="F")
levels(InsectSprays2$spray)
InsectSprays2

So for you try...
levels (Data1$Site) <- list(Fw =c( "AB"), Est = c("DE"))
 
> From: deelman@hotmail.com
> To: r-help@r-project.org
> Date: Sun, 14 Aug 2011 12:56:25 -0300
> Subject: [R] Renaming levels of a factor in a dataframe
> 
> 
> 
> Dear Helplist:
> 
> 
> 
> I am trying, unsuccessfully, to rename levels of a factor in a dataframe.
The dataframe consists of two factor variables and one numeric variable as
follows:
> 
> Factor Site has 2 levels AB and DE, factor Fish has 30 levels, 15
associated with each Site e.g. 1-1, 1-2,.....2-1, 2-2.... I am trying to rename
the levels of factor Site from AB to Fw and DE to Est while keeping them as
factors. The following 2 approaches do not work, each giving a NULL response and
creating a character string.
> 
> 
> 
> levels (Data1$Site <- c("Fw", "Est")) This simply
gives an alternating list of Fw, Est, Fw, Est... not the desired 15 concurrent
rows of Fw followed by 15 of Est.
> 
> 
> 
> #levels (Data1$Site <- list(Fw = "AB", Est = "DE"))
This gives the same result. I have tried other approaches to no avail. It seems
a simple problem but has not been so.
> 
> 
> 
> Any suggestions for solving this problem would be much appreciated.
> 
> 
> 
> Regards,
> 
> BJ 
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