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paladini

2013-Jan-16 09:56 UTC

[R] How to change levels?

Hello!
I have got a dataframe with 10 columns and 100 rows. The seventh column 
consists of a lot of country names.
When I use newdata=subset(data, data[, 7]=="United Kingdom"|data[, 
7]=="Germany") I get just the rows where the country name is UK or 
Germany.
But the level information doesn`t change. That means if I use 
levels(newdata[,7]), I get:

  [1] "Austria"                  "Belgium"
  [3] "Denmark"                  "Finland"
  [5] "France"                   "Germany"
  [7] "Spain"                    "Sweden"
  [9] "Switzerland"              "The Netherlands"
  [11] "United Kingdom"           "United States of America"
That leads to problems in the further data processing .

How can I change the level information to the real levels of newdata?

Thanking you in anticipation

Claudia

Ista Zahn

2013-Jan-16 17:35 UTC

head link

[R] How to change levels?

Hi,

see ?droplevels and/or the "stringsAsFactors" section of ?options

Best,
Ista

On Wed, Jan 16, 2013 at 4:56 AM, paladini <paladini at
beuth-hochschule.de> wrote:> Hello!
> I have got a dataframe with 10 columns and 100 rows. The seventh column
> consists of a lot of country names.
> When I use newdata=subset(data, data[, 7]=="United
Kingdom"|data[,
> 7]=="Germany") I get just the rows where the country name is UK
or Germany.
> But the level information doesn`t change. That means if I use
> levels(newdata[,7]), I get:
>
>  [1] "Austria"                  "Belgium"
>  [3] "Denmark"                  "Finland"
>  [5] "France"                   "Germany"
>  [7] "Spain"                    "Sweden"
>  [9] "Switzerland"              "The Netherlands"
>  [11] "United Kingdom"           "United States of
America"
> That leads to problems in the further data processing .
>
> How can I change the level information to the real levels of newdata?
>
> Thanking you in anticipation
>
> Claudia
>
> ______________________________________________
> 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.

PIKAL Petr

2013-Jan-17 07:07 UTC

head link

[R] How to change levels?

Hi

or you can just call factor function after subsetting

newdata[,7] <- factor (newdata[,7])

Regards
Petr
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Ista Zahn
> Sent: Wednesday, January 16, 2013 6:36 PM
> To: paladini
> Cc: r-help at r-project.org
> Subject: Re: [R] How to change levels?
> 
> Hi,
> 
> see ?droplevels and/or the "stringsAsFactors" section of ?options
> 
> Best,
> Ista
> 
> On Wed, Jan 16, 2013 at 4:56 AM, paladini <paladini at beuth-
> hochschule.de> wrote:
> > Hello!
> > I have got a dataframe with 10 columns and 100 rows. The seventh
> > column consists of a lot of country names.
> > When I use newdata=subset(data, data[, 7]=="United
Kingdom"|data[,
> > 7]=="Germany") I get just the rows where the country name is
UK or
> Germany.
> > But the level information doesn`t change. That means if I use
> > levels(newdata[,7]), I get:
> >
> >  [1] "Austria"                  "Belgium"
> >  [3] "Denmark"                  "Finland"
> >  [5] "France"                   "Germany"
> >  [7] "Spain"                    "Sweden"
> >  [9] "Switzerland"              "The Netherlands"
> >  [11] "United Kingdom"           "United States of
America"
> > That leads to problems in the further data processing .
> >
> > How can I change the level information to the real levels of newdata?
> >
> > Thanking you in anticipation
> >
> > Claudia
> >
> > ______________________________________________
> > 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.
> 
> ______________________________________________
> 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.

R help - Jan 2013 - How to change levels?

[R] How to change levels?

[R] How to change levels?

[R] How to change levels?