[R] Quantiles of a subset of data
Peter.Brecknock at bp.com
Tue Feb 19 17:36:36 CET 2013
> Thanks for your help Pete. I can almost get it to work with;
> but this only gives me 0% 25% 50% 75% 100%, not the ones I'm looking
> for, 10% and 90%.
> I have tried;
>> by(day,year,quantile(c(0.1, 0.9))) but this is rejected by
> Error in FUN(X[[1L]], ...) : could not find function "FUN"
Need to add the quantiles of interest .....
# Dummy Data
d <- data.frame(year=c(rep(2010,10),rep(2011,10),rep(2012,10)), quantity =
# Quantiles by Year
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