[R] Quantiles of a subset of data
Peter.Brecknock at bp.com
Tue Feb 19 16:52:59 CET 2013
> Excuse the request from an R novice! I have a data frame (DATA) that has
> two numeric columns (YEAR and DAY) and 4000 rows. For each YEAR I need to
> determine the 10% and 90% quantiles of DAY. I'm sure this is easy enough,
> but I am a new to this.
> 10% 90%
> 12 29
> But this is for the entire 4000 rows, when I need it to be for each YEAR.
> Is there no way to use a "by" argument in the quantile function?
> Thanks for any help you can provide.
?aggregate or ?by should be of help
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