if expects just one condition (no vectors); see ?ifelse

dataframe$thevector <- ifelse(dataframe$factor=="3", a.mean,
dataframe$thevector)


K

On Wed, Oct 1, 2008 at 12:05 PM, Whitt Kilburn <kilburnw@gvsu.edu> wrote:

> Hello all,
>
> I apologize for a terribly simple question.  I'm used to using Stata and am
> trying to `switch' over to R.
>
> I would like to recode a vector in a data frame when the value of it meets
> the following condition:  if
> (dataframe$factor=='3'){dataframe$thevector<-(an arithmetic mean).  What I
> would like to result is the creation of a new variable within the data frame
> for which all observations that =='3' get the mean.  Yet, I receive an error
> message that R is only reading the first element of the factor:
>
> Warning message:
> In if (nes2004$Rrace2 == "1") { :
>  the condition has length > 1 and only the first element will be used
>
> As the command in question actually appears:
> if (nes2004$Rrace2=='3') {
> nes2004$Hethno<-(((nes2004$Hint-nes2004$Wint)+(nes2004$Hint-nes2004$Bint)+(nes2004$Hint-nes2004$Aint)+(nes2004$Hwork-nes2004$Wwork)+(nes2004$Hwork-nes2004$Bwork)+(nes2004$Hwork-nes2004$Awork)+(nes2004$Htrus-nes2004$Wtrus)+(nes2004$Htrus-nes2004$Btrus)+(nes2004$Htrus-nes2004$Atrus))/9)
> }
>
> The other problem here too, is that each of these variables contain varying
> counts of NA observations.
>
> I've tried to work around this by using ifelse, and other commands, but I
> can not figure out where to begin re-thinking how I do this.  Any guidance
> would be appreciated.
>
> Thank you.
> Whitt
>
>
>
> ****************************************
> H. Whitt Kilburn, Ph.D.
> Assistant Professor
> Grand Valley State University
> Political Science Department
> 1124 AuSable Hall
> 1 Campus Drive
> Allendale, MI 49401-9403
> Phone:(616) 331-8831
> Fax:(616) 331-3550
> http://faculty.gvsu.edu/kilburnw
>
> ______________________________________________
> R-help@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.
>

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