Thank you!
Sigalit.


On 11/2/07, Marc Schwartz <marc_schwartz@comcast.net> wrote:
>
> On Fri, 2007-11-02 at 22:02 +0200, sigalit mangut-leiba wrote:
> > Hello,
> > I want to create a new variable which includes 4 age categories in this
> way:
> >
> > if (age>=12 && age<32) age1==1
> >
> > if (age>=32 && age<52) age1==2
> >
> > if (age>=52 && age<72) age1==3
> >
> > if (age>=72 && age<100) age1==4
> >
> > but I get the results only for the first observation.
> >
> > how can I apply this condition to all observations?
> >
> > Thanks in advance,
> >
> > Sigalit.
>
> The if() function can only return a single result, so you would have to
> create something along the lines of an if...else construct.
>
> Alternatively, you can use cut():
>
> age <- 12:99
>
> > cut(age, breaks = c(12, 32, 52, 72, 100), labels = 1:4, include.lowest =
> TRUE)
> [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2
> [35] 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4
> [69] 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
> Levels: 1 2 3 4
>
>
> Note that this returns a factor. If you want an actual integer value,
> you would have to coerce the result.
>
> See ?cut for more information.
>
> HTH,
>
> Marc Schwartz
>
>
>

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