Try this:
data.frame(ID = x$ID,
Max_Exposure = max(rowSums(x[,-1] == "y")),
Unique_Exposure = rowSums(x[,-1] == "y"))
On Tue, Aug 5, 2008 at 10:21 AM, Michael Pearmain <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> i have a dataset that i want to dynamically inspect for the number of
> variables that start with "Exposure_" and then for these count the entries
> across each case i.e
>
> ID Exposure_1 Exposure_2 Exposure_3
> 1 y y y
> 2 y y -
> 3 y - -
>
> So the corresponding new variables that would be created are
>
> ID Max_Exposure Unique_Exposure
> 1 3 3
> 2 3 2
> 3 3 1
>
> I know this may seem fairly basic but it will give me the starting point to
> develop more advanced things with loop and nat lang
>
> Thanks in advance
>
> Mike
>
> [[alternative HTML version deleted]]
>
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>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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