Hi,
just put it in the formula:
aggregate(Number ~ Letter+Test,data=dtf,max)
cheers
Am 13.10.2011 19:30, schrieb syrvn:
> Hello again,
>
>
> dtf<-read.table(textConnection("Letter Test Number
> a b 1
> a b 1
> b b 1
> b b 0
> c b 0
> c b 1
> d b 0
> d b 0"),header=T)
> aggregate(Number ~ Letter,data=dtf,max)
>
> how can I adjust this solution that the results also includes "Test"?
>
> I tried:
>
> aggregate(Number ~ Letter,data=dtf,max,by=list("Letter", "Test", "Number"))
>
> But it breaks with the following error message:
>
> Error in aggregate.data.frame(mf[1L], mf[-1L], FUN = FUN, ...) :
> arguments must have same length
>
>
>
>
>
> --
> View this message in context:
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> Sent from the R help mailing list archive at Nabble.com.
>
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--
Eik Vettorazzi
Institut für Medizinische Biometrie und Epidemiologie
Universitätsklinikum Hamburg-Eppendorf
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