Hi Kasia,

You need

subset(REC2,  INFECTION=="Infected ")

(note the space after "Infected").

HTH,
Jorge.-


On Fri, May 3, 2013 at 7:48 PM, Katarzyna Kulma
<katarzyna.kulma@gmail.com>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
>
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>
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