[R] removing factor values in the main data frame

[Ulrik Stervbo]

Hi,

I think droplevels(df) is what you are looking for.

Best wishes,
Ulrik

On Tue, 1 Mar 2016 at 17:33 hoda rahmati via R-help <r-help at r-project.org>
wrote:

> Hi all,I have the following main data frame:(mydata)        $ TE : num 40
> 40 20 20 20 20 20 20 20 40 ...        $ TR : num 49 49 28 28 28 28 28 28 28
> 49 ...        $ COUNTRY : Factor w/ 27 levels "","AU","BA","BE",..: 8 8 8 8
> 8 ...among the COUNTRY I just need US and AU,first I get a subset to
> contain just these two countries:
>  submydata=subset(mydata,COUNTRY%in%c("US","AU"))
>  factor(submydata$COUNTRY) but after this when I get str of mydata again I
> have the same data frame with no changes in COUNTRY, however I want mydata
> to be like:
>        $ TE : num 40 40 20 20 20 20 20 20 20 40 ...        $ TR : num 49
> 49 28 28 28 28 28 28 28 49 ...       $ COUNTRY : Factor w/ 2 levels
> "","AU","US",..: 8 8 8 8 8 8 8 8 8 8Thanks for any help
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