Quantiles of a subset of data

bradleyd wrote

Thanks for your help Pete. I can almost get it to work with;

by(day,year,quantile)

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 =
c(1:30)) 

# Quantiles by Year
by(d$quantity,d$year,quantile,c(0.1,0.9))

HTH

Pete



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