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

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How to change levels?

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