[R] R does not subset

[David Kulp]

You have an extra space in the INFECTION factors.

Use REC2[REC2$INFECTION=="Infected ",]
or
subset(REC2, INFECTION=="Infected ")

No need to use which here.

On May 3, 2013, at 5:48 AM, Katarzyna Kulma wrote:

> Hi everyone,
> 
> I know there have been several requests regarding subsetting before, but
> none of them really helps with my problem:
> 
> I'm trying to subset only infected individuals from the REC2 data.frame:
> 
>> str(REC2)
> 'data.frame':    362 obs. of  7 variables:
> $ RINGNO   : Factor w/ 370 levels "BL17546","BL17577",..: 78 81 67 41 58
> 66 17
> $ year     : Factor w/ 8 levels "Y2002","Y2003",..: 1 2 1 2 1 1 2 1 1 3 ...
> $ ccFLEDGE : int  6 6 6 5 6 7 6 7 6 5 ...
> $ rec2012  : int  2 1 2 2 1 2 1 1 1 0 ...
> $ binage   : Factor w/ 2 levels "ad","juv": 1 2 1 1 1 1 1 1 1 1 ...
> $ INFECTION: Factor w/ 2 levels "Infected ","Uninfected ": 2 1 2 1 2 2 1 2
> 2 1 ...
> $ all.rsLD : num  -4.62 -6.19 -3.62 -4.19 -2.62 ...
> 
> using either
> 
> RECinf<-REC2[which (REC2$INFECTION=="Infected"),]
> 
> or
> 
> RECinf<-subset(REC2,  INFECTION=="Infected")
> 
> in both cases I get empty data frame (0 observations):
> 
>> str(RECinf)
> 'data.frame':    0 obs. of  7 variables:
> $ RINGNO   : Factor w/ 370 levels "BL17546","BL17577",..:
> $ year     : Factor w/ 8 levels "Y2002","Y2003",..:
> $ ccFLEDGE : int
> $ rec2012  : int
> $ binage   : Factor w/ 2 levels "ad","juv":
> $ INFECTION: Factor w/ 2 levels "Infected ","Uninfected ":
> $ all.rsLD : num
> 
> When subsetting, R doesn't return any warning or error message. Besides, I
> used same codes many times before and they worked perfectly well. Any ideas
> why this case is different?
> 
> Thanks for your help,
> Kasia
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.