I also tried droplevels but after getting str(submydata) again I see no changes
in COUNTRY
On Tuesday, March 1, 2016 8:38 AM, Ulrik Stervbo <ulrik.ster...@gmail.com>
wrote:
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@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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