[R] Grouping by interval

[Henrique Dallazuanna]

Try this:
Vec <- cut(Data[,1], breaks=c(10,15,20,25,30), include=T, right=F)
Data <- data.frame(Data, Vec)
aggregate(Data[,2:3], list(Data$Vec), mean)



On 07/12/2007, Sonia Mehault <mehault at iim.csic.es> wrote:
> Hello,
>
> I have a dataframe of say 20 lines with one line per individual. I want to group these 20 individuals
> by length class (eg. of 5cm) and get the mean value of all the other variables (eg VarA and VarB) for each length class
>
> My dataframe is as follow:
>
> Length <- 10:30
> VarA <- seq(1000,1200,10)
> VarB <- seq(500,700,10)
> Data <- cbind(Length,VarA,VarB)
>
>
> And I want to get something like:
>
>
> Length Class      Mean VarA       Mean VarB
> [10-15[               1020                520
> [15-20[               1070                570
> [20-25[               1120                620
> [25-30]               1175                675
>
>
> Would you have any suggestions how to do that ?
> Many thanks.
>
>
> Sonia.
>
>        [[alternative HTML version deleted]]
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O