Hi, I have imported some data to R from stata and my factor variables have an Indeterminate level which I don't really want. For example the variable sex has the levels Male, Female and Indeterminate. There are no 'Indeterminate' values in the data. Can somebody tell me how to get rid of this level as it restricting my cox ph model. Thanks Neil
Try:> sex <- factor(sample(c("M", "F"), 10, replace=TRUE), levels=c("M", "F","I"))> sex[1] F F M F F F M M M F Levels: M F I> sex2 <- sex[, drop=TRUE] > sex2[1] F F M F F F M M M F Levels: M F HTH, Andy> From: Neil Leonard > > Hi, > > I have imported some data to R from stata and my factor > variables have > an Indeterminate level which I don't really want. For example the > variable sex has the levels Male, Female and Indeterminate. There are > no 'Indeterminate' values in the data. Can somebody tell me > how to get > rid of this level as it restricting my cox ph model. > > Thanks > Neil > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > >
Hi Neil,
you could try
sex <- sex[,drop=TRUE]
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/396887
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Neil Leonard" <nleonard at tartarus.uwa.edu.au>
To: "r help" <r-help at stat.math.ethz.ch>
Sent: Thursday, October 07, 2004 4:13 PM
Subject: [R] Remove Indeterminate Level
> Hi,
>
> I have imported some data to R from stata and my factor variables
> have an Indeterminate level which I don't really want. For example
> the variable sex has the levels Male, Female and Indeterminate.
> There are no 'Indeterminate' values in the data. Can somebody tell
> me how to get rid of this level as it restricting my cox ph model.
>
> Thanks
> Neil
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>
On Thu, 7 Oct 2004, Neil Leonard wrote:> Hi, > > I have imported some data to R from stata and my factor variables have an > Indeterminate level which I don't really want. For example the variable sex > has the levels Male, Female and Indeterminate. There are no 'Indeterminate' > values in the data. Can somebody tell me how to get rid of this level as it > restricting my cox ph model. >Two ways to do this are in the Examples section of help(factor) -thomas