Re: [R] Unexpected behavior in recode{car}

From: Mulholland, Tom <Tom.Mulholland_at_dpi.wa.gov.au>
Date: Thu 28 Jul 2005 - 17:01:05 EST


require( car )
set.seed(12345)
nn <- sample( c( 2, 4 ), size=50, replace=TRUE ) rr <- recode( nn, "2='TWO';4='FOUR'" )
table( rr, exclude=NULL )
ss <- recode( nn, "2='Num2';4='Num4'" ) # Doesn't work as expected table( ss, exclude=NULL )
ss <- recode( nn, "2='Num2';4='Num4'", TRUE ) #? table( ss, exclude=NULL )
tt <- recode( nn, "2='TWO'; 4='Num4'" )
table( tt, exclude=NULL )
uu <- recode( nn, "2='Num2'; 4='FOUR'" ) table( uu, exclude=NULL )

I looked at the code and found it too difficult to immediately decipher. So does making the result a factor cause any real problems?

I noticed that the same response happens with any letterset followed by a number recode( nn, "2='Num2'; 4='abc5'" )

Tom

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch]On Behalf Of D. Dailey
> Sent: Thursday, 28 July 2005 11:45 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] Unexpected behavior in recode{car}
>
>
> Thanks to the R creators for such a great statistical system.
> Thanks to
> the R help list, I have (finally) gotten far enough in R to have a
> question I hope to be worth posting.
>
> I'm using the recode function from John Fox's car package and have
> encountered some unexpected behavior.
>
> Consider the following example:
>
> ## Begin cut-and-paste example
> require( car )
> set.seed(12345)
> nn <- sample( c( 2, 4 ), size=50, replace=TRUE )
> rr <- recode( nn, "2='TWO';4='FOUR'" )
> table( rr, exclude=NULL )
> ss <- recode( nn, "2='Num2';4='Num4'" ) # Doesn't work as expected
> table( ss, exclude=NULL )
> tt <- recode( nn, "2='TWO'; 4='Num4'" )
> table( tt, exclude=NULL )
> uu <- recode( nn, "2='Num2'; 4='FOUR'" )
> table( uu, exclude=NULL )
> ## End cut-and-paste example
>
> All but the recoding to ss work as expected: I get a character vector
> with 23 instances of either "FOUR" or "Num4" and 27 instances of "TWO"
> or "Num2".
>
> But for the ss line, wherein all the strings to be assigned contain a
> digit, the resulting vector contains all NAs. Using str(), I note that
> ss is a numeric vector.
>
> Is there a tidy way (using recode) to recode numeric values into
> character strings, all of which contain a digit? I have a
> workaround for
> my current project, but it would be nice to be able to use mixed
> alphanumeric strings in this context.
>
> Thanks in advance for any insight you can give into this question.
>
> Using R 2.1.1 (downloaded binary) on Windows XP Pro, car
> version 1.0-17
> (installed from CRAN via Windows GUI). Complete version information
> below:
>
> > version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 1.1
> year 2005
> month 06
> day 20
> language R
>
> > t(t( installed.packages()['car',] ))
> [,1]
> Package "car"
> LibPath "C:/Programs/R/rw2011/library"
> Version "1.0-17"
> Priority NA
> Bundle NA
> Contains NA
> Depends "R (>= 1.9.0)"
> Suggests "MASS, nnet, leaps"
> Imports NA
> Built "2.1.0"
>
>
> I subscribe to the help list in digest form, so would appreciate being
> copied directly in addition to seeing responses sent to the list.
>
> David Dailey
> Shoreline, Washington, USA
> Lists@CompassRoseEnterprises.com
>
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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.html Received on Thu Jul 28 17:05:46 2005

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