documentation error for quantile (PR#1660)

rjvbertin@hotmail.com rjvbertin@hotmail.com
Wed, 12 Jun 2002 23:01:59 +0200 (MET DST)

```>From the documentation to the quantile function:

...

`quantile(x,p)' as a function of `p' linearly interpolates the
points ( (i-1)/(n-1), ox[i] ), where `ox <- order(x)' (the ``order
statistics'') and `n <- length(x)'.

This gives `quantile(x, p) == (1-f)*ox[i] + f*ox[i+1]', where `r
<- 1 + (n-1)*p', `i <- floor(r)', `f <- r - i' and `ox[n+1] :=
ox[n]'.

I think that should be ox <- x[ order(x) ] ! At least, then the formulae
give the same result as quantile itself!

RenE J.V. Bertin
College de France/LPPA
11, place Marcelin Berthelot
75005 Paris, France

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