[R] Quantiles of a subset of data

Pete Brecknock Peter.Brecknock at bp.com
Tue Feb 19 19:51:34 CET 2013

bradleyd wrote
> That does it, thanks. Do you think you help me a little bit further?
> I actually have 4 columns, YEAR, DAY, TEMP , and IBI. They are all
> numeric. I need to calculate the average TEMP and IBI values between the
> 10% and 90% quantiles  for each YEAR.
> The code 
> by(data$day,data$year,day,c(0.1,0.9))
>  was correct in that it calculated the quantile values as intended, but I
> don't know how to then calculate the mean TEMP and IBI values encompasses
> within those quantiles.
> Thanks again,
> David

have a look at trim argument of the mean function



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