[R] median of grouped data

cmr.Pent at gmail.com cmr.Pent at gmail.com
Mon Jun 30 10:31:59 CEST 2008

On 28 июн, 03:19, "Bricklemyer, Ross S" <r... at wsu.edu> wrote:
> I am having difficulty calculating the median of grouped data.  I have 8 to 10 repeated measures per sample and I have successfully used the following code to calculate the average for each sample.
> libs.norm.preds.median[,7:9]<-apply(libs.norm.preds.median[,7:9],MARGIN=2, FUN=ave,libs.norm.preds.median[,1])

You might want to create a wrapper around "ave" like this:

myave <- function(..., ave.FUN = mean)
  ave(..., FUN = ave.FUN)

and pass needed ave.FUN parameter to "apply".


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