[R] help calculating variable based on factor level of another

[Joshua Wiley]

Sorry that last bit of code was redundant, it should be:

x2 <- ifelse(x1=="social and cultural specialists", "1", "0")

ifelse() leaves NAs by default so no need to manually do it.

On Thu, May 27, 2010 at 7:30 AM, Joshua Wiley <jwiley.psych at gmail.com> wrote:
> Dear Simon,
>
> It is a bit hard to tell what you want without a reproducible example,
> below is my guess.  I created x1 as a factor with some data in it
> based off of what I think you are working with and then x2 from x1.
>
> ################################
> data <- c("social and cultural specialists", "labour","salariat")
> x1<-factor(rep(data,3), levels=data, labels=data)
> x1[10] <- NA
> x2 <- ifelse(x1=="social and cultural specialists", "1",
> ifelse(is.na(x1), "NA", "0"))
> x2
> ################################
>
> Hope that helps,
>
> Josh
>
> On Thu, May 27, 2010 at 6:59 AM, Simon Kiss <sjkiss at gmail.com> wrote:
>> Dear colleagues,
>>
>> I want to calculate the value of x2 based on the value of x1.  x1 is a
>> factor with three separate levels. I want to make sure that missing
>> values remain as NA in X2, but non-missing values take on a value of
>> either 0  or 1 dependending on the value in x1.
>>
>> This is the code I'm working with...Can any one help?
>> I've seen some other requests on a topic like this, but not using factors
>> with strings as levels; only with numeric variables.
>> Simon
>>
>> x1<-factor(levels="social and cultural specialists", "labour",
>> "salariat")
>>
>> x2<-if(x1==c("social and cultural specialists")) "1" elseif (x1==NA)
>> "NA" else "0"
>> *********************************
>> Simon J. Kiss, PhD
>> SSHRC and DAAD Post-Doctoral Fellow
>> John F. Kennedy Institute of North America Studies
>> Free University of Berlin
>> Lansstraße 7-9
>> 14195 Berlin, Germany
>> Cell: +49 (0)1525-300-2812,
>> Web: http://www.jfki.fu-berlin.de/index.html
>>
>> ______________________________________________
>> 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.
>>
>
>
>
> --
> Joshua Wiley
> Senior in Psychology
> University of California, Riverside
> http://www.joshuawiley.com/
>



-- 
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/