From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>

Date: Fri 03 Feb 2006 - 03:32:54 EST

Date: Fri 03 Feb 2006 - 03:32:54 EST

Marc Bernard <bernarduse1@yahoo.fr> writes:

> Dear All,

*>
**> I wonder how to re-code a categorical variable without using the ifelse loops. For example:
*

(What's an "ifelse loop"???)

> Let X be a categorical variable with 6 levels, levels(X) = c(1,2,3,4,5,6)

*>
**> How to create a new categorical variable Y with levels, 10,11,12, say , such that:
**> Y = 10 if X =1 or X=2
**> Y = 11 if X =3 or 4
**> Y =11 if X = 5 or 6
*

One way is the recode() function in the car package. Another is

Y <- X

levels(Y) <- c(10,10,11,11,12,12)

or

levels(Y) <- list("10"=c(1,2),"11"=c(3,4),"12"=c(5,6))

and a 4th one could be

Y <- factor(c(10,10,11,11,12,12)[X])

(which may need a safeguarding "levels=c(10,11,12)" in case not all levels are present).

-- O__ ---- Peter Dalgaard ุster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 ______________________________________________ R-help@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.htmlReceived on Fri Feb 03 03:49:56 2006

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