Re: [R] Recode of text variables

Rolf Turner Wed, 01 Apr 2009 16:50:50 -0700


Uhhh, Bill, he wanted E to be recoded as ``Treat 3''.
And he didn't say ***what*** he wanted to happen to D.

Fancy.  A chance to ``correct'' Bill Venables for a second time
in two days! :-)

        cheers,

                Rolf

On 2/04/2009, at 12:39 PM, bill.venab...@csiro.au wrote:

Here is one way

x <- c("A", "B", "C", "D", "E", "A")
x

[1] "A" "B" "C" "D" "E" "A"

f <- factor(x)
levels(f)

[1] "A" "B" "C" "D" "E"

levels(f) <- c(rep("Treat1",2), rep("Treat2", 3))
f

[1] Treat1 Treat1 Treat2 Treat2 Treat2 Treat1
Levels: Treat1 Treat2


If you really want the charactre variable you can put

x <- as.character(f)


_____

That's fascinating about Microsoft Access, but, uh... never mind.


        Yeah.  ***Absolutely fascinating***. :-)

        Remind me to tell you sometime the story about the girl
        who went to finishing school in Switzerland ....

                R.

Bill Venables
http://www.cmis.csiro.au/bill.venables/


-----Original Message-----

From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Andrew McFadden

Sent: Thursday, 2 April 2009 9:23 AM
To: r-help@r-project.org
Subject: [R] Recode of text variables

Hi all

I am trying to do a simple recode which I am stumbling on. I figure
there must be any easy way but haven't come across it.

Given data of A","B","C","D","E","A" it would be nice to recode this

into say three categories ie A and B becomes "Treat1", C becomes"Treat

2" and E becomes "Treat 3".

I tried the car library but it didn't seem to like text. Also it seems
you can only recode into two categories.


library(car)

x<-c("A","B","C","D","E","A")
x
recode(x, "c(A,B)='Treat 1'; else='Treat 2'")
recode(x, "1:2='A'; 3='B'")

In Microsoft access a simple way of recoding is to join two tablesin a

query any simple way of doing the same in R?



Kind regards

Andy

Andrew McFadden MVS BVSc
Incursion Investigator
Investigation & Diagnostic Centres - Wallaceville Biosecurity New
Zealand Ministry of Agriculture and Forestry

Phone 04 894 5600 Fax 04 894 4973 Mobile 029 894 5611 Postal address:
Investigation and Diagnostic Centre- Wallaceville Box 40742 Ward St
Upper Hutt

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Re: [R] Recode of text variables

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