[R] how to compute the inverse percentile of a given observation w.r.t. a reference distribution

[David Winsemius]

On May 25, 2011, at 3:42 PM, rudi wrote:

> Hi,
>
> can anyone help me to figure out how to compute the percentile of an
> individual observation with respect to a reference distribution.
>
> What I mean is. Let's assume I have a vector consisting of 10 numbers
> {3,5,8,1,9,5,4,3,5.5,7} and I want figure out what percentile the
> number 4.9 corresponds to. I failed to find any reference to such a
> function, although I would assume this must frequently be necessary.

?quantile

Talking about percentiles when you only have 10 numbers seems rather  
misleading, don't you think?

-- 
David Winsemius, MD
West Hartford, CT