[R] Recode of text variables

Gabor Grothendieck ggrothendieck at gmail.com
Thu Apr 2 04:36:55 CEST 2009


doBy and memisc packages have recoding functions as well, e.g.

> library(doBy)
> x<-c("A","B","C","D","E","A")
> out <- recodevar(x, list(c("A", "B"), c("C", "D", "E")), list("Treat 1", "Treat 2"))
> recodevar(x, list(c("A", "B"), c("C", "D", "E")), list("Treat 1", "Treat 2"))
[1] "Treat 1" "Treat 1" "Treat 2" "Treat 2" "Treat 2" "Treat 1"

It would be possible to use the merge function or the sqldf package do
something similar to MS Access.

On Wed, Apr 1, 2009 at 7:22 PM, Andrew McFadden
<Andrew.McFadden at maf.govt.nz> wrote:
> 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 tables in 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
>
>
> ########################################################################
> This email message and any attachment(s) is intended solely for the
> addressee(s) named above. The information it contains is confidential
> and may be legally privileged.  Unauthorised use of the message, or the
> information it contains, may be unlawful. If you have received this
> message by mistake please call the sender immediately on 64 4 8940100
> or notify us by return email and erase the original message and
> attachments. Thank you.
>
> The Ministry of Agriculture and Forestry accepts no responsibility for
> changes made to this email or to any attachments after transmission from
> the office.
> ########################################################################
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>




More information about the R-help mailing list