Fwd: Re: Tcl8.0.4 missing function?! (PR#1640)

[rjvbertin@hotmail.com]

>From: Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk>
>To: "RenE J.V. Bertin" <rjvbertin@hotmail.com>
>Subject: Re: Tcl8.0.4 missing function?! (PR#1640)
>Date: 12 Jun 2002 19:37:21 +0200
> >
> > From help(quantile):
> >
> > ...
> >
> >     `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 what is meant is 'ox <- x[order(x)]'?! When I do that,
> > the values from the above formulae correspond to what quantile() gives
> > me...!



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

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