On Thu, Nov 21, 2013 at 8:35 AM, Trevor Walker
<trevordaviswalker@gmail.com>wrote:

> I often work with tree data that is sampled with probability proportional
> to size, which presents a special challenge when describing the frequency
> distribution.



The survey package does lots of calculations (including quantiles) for
unequal-probability samples.


-- 
Thomas Lumley
Professor of Biostatistics
University of Auckland

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