[R] Quantiles of data in a contingency table

From: Matt Mohebbi <mmohebbi_at_gmail.com>
Date: Thu 17 Mar 2005 - 18:42:23 EST


Hello,

I have data of the following form:

> data <- data.frame(type=c("c","d","e"), size=c(10,20,30), count=c(20,10,5))
> data


  type size count
1 c 10 20
2 d 20 10
3 e 30 5

I would like to compute the quantiles of size given the counts. For instance, in this example, the median size would be 10. Is there an easy way of doing this?

Is there a good way to deal with data in this format in general? Much of R seems to center around having an entry for each item. This question (http://www.r-project.org/nocvs/mail/r-help/2000/0102.html) seems to be related but no one provided an answer.

Thanks,
Matt



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