Hi
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Duncan
> Murdoch
> Sent: Monday, October 26, 2015 11:58 AM
> To: Lorenz, Jennifer; r-help at r-project.org
> Subject: Re: [R] Creating new variables in R
>
> On 26/10/2015 6:24 AM, Lorenz, Jennifer wrote:
> > Hi,
> >
> > I have a question regarding the creation of new variables on the
> basis of existing ones in R.
> >
> > I have two variables containing information on parents'
educational
> degree (e.g. 1 'high school degree', 2 'college degree',
etc.). I would
> like to create a new variable for 'parents' highest educational
> degree', i.e. if variable1 (father's degree) is higher than
variable2
> (mother's degree) than the new variable (variable3) should take on the
> value of variable1, if not, than variable3 should take on the value of
> variable2.
> >
> > I usually use SPSS for data manipulation, there I would code
> variable3 as follows:
> > COMPUTE variable3= 0.
> > IF variable1 > variable2 variable3= variable1.
> > IF variable1 <= variable2 variable3= variable2.
> >
> > The closest I came to that in R was with this code:
> > data$variable3 <- 0
> > data$variable3[data$variable1 > data$variable2]<-data$variable1
> > data$variable3[data$variable1 <= data$variable2]<-data$variable2
> >
> > I also tried:
> > data$variable3 <- ifelse(data$variable1 > data$variable2),
> > data$variable1, data$variable2)
> >
> > Both didn't work.
The ifelse version should work. Are you sure that variable 1 and 2 are numeric?.
What is a result of str(data)?
Cheers
Petr
> >
> > I am not sure if my post is at all understandable (this is my first
> time posting on R-help), but I am really hoping for some advice!
>
> This is a good place to use the ifelse() function:
>
> data$variable3 <- ifelse(data$variable1 > data$variable2,
> data$variable1, data$variable2)
>
> Duncan Murdoch
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
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