thr3ads.net - R help - [R] removing factor values in the main data frame [Mar 2016]

If this information is useful, please help other people find it:
Share via:

hoda rahmati

2016-Mar-01 16:29 UTC

[R] removing factor values in the main data frame

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
	[[alternative HTML version deleted]]

hoda rahmati

2016-Mar-01 16:32 UTC

head link

[R] Fw: removing factor values in the main data frame

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

  
	[[alternative HTML version deleted]]

Ulrik Stervbo

2016-Mar-01 16:38 UTC

head link

[R] removing factor values in the main data frame

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
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
	[[alternative HTML version deleted]]

hoda rahmati

2016-Mar-01 16:42 UTC

head link

[R] removing factor values in the main data frame

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.stervbo at
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 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
? ? ? ? [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.


  
	[[alternative HTML version deleted]]

David L Carlson

2016-Mar-01 17:33 UTC

head link

[R] Fw: removing factor values in the main data frame

You need to learn how to send emails in plain text since html gets mangled on
r-help. See your message below. If I understand your question, it has to do with
what happens to factor levels when you subset your data. Subsetting a factor
does not remove empty factor levels. This is documented on the manual page for
subset():

"Factors may have empty levels after subsetting; unused levels are not
automatically removed. See droplevels for a way to drop all unused levels from a
data frame."

------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352


-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of hoda rahmati
via R-help
Sent: Tuesday, March 1, 2016 10:32 AM
To: r-help at r-project.org
Subject: [R] Fw: removing factor values in the main data frame

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

  
	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.

R help - Mar 2016 - removing factor values in the main data frame

[R] removing factor values in the main data frame

[R] Fw: removing factor values in the main data frame

[R] removing factor values in the main data frame

[R] removing factor values in the main data frame

[R] Fw: removing factor values in the main data frame