[R] FW: Renaming levels of a factor in a dataframe

[B Jessop]

Tyler,

 

Tried your solution: levels (Data1$Site <- list(Fw = c("AB"), Est = c("DE"))) 

 

but still got a NULL response to str(Data1) and an alternating list of Fw, Est, Fw, Est under Site when looked at in the Data editor in R console. The use of the "levels" function would seem to be appropriate but tricky to use.  Any other ideas would be welcome.

 

Regards,

BJ

________________________________
> From: tyler_rinker at hotmail.com 
> To: deelman at hotmail.com; r-help at r-project.org 
> Subject: RE: [R] Renaming levels of a factor in a dataframe 
> Date: Sun, 14 Aug 2011 13:18:12 -0400 
> 
> 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 at hotmail.com 
> > To: r-help at 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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