[R] median of grouped data

[cmr.Pent at gmail.com]

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".

Andrey