[R] Grouping by interval
bcarvalh at jhsph.edu
Fri Dec 7 14:43:22 CET 2007
Check the cut() function.
On Dec 7, 2007, at 4:04 AM, "Sonia Mehault" <mehault at iim.csic.es> wrote:
> 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.
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