[R] Compute quantiles with values and correspondent frequencies

[Roger Bivand]

On Fri, 3 Mar 2006, Paolo Radaelli wrote:

> Dear List, quantile(x) function allows to obtain specified quantiles of
> a vector of observations x.
> 
> Is there an analogous function to compute quantiles in the case one have
> the vector of the observations x and the correspondent vector f of
> relative frequencies ?

Just use rep():

x <- rpois(100, 4) # data
quantile(x)
tx <- table(x) # frequencies (need to be integer counts)
tx
v <- as.numeric(names(tx)) # values
quantile(rep(v, as.integer(tx)))

You have v and tx, so this should work.

> 
> Thank you
> 
> Paolo Radaelli
> 
> 
> 
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> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no