On 29 Nov 2006 at 12:08, Peter Dalgaard wrote:
Date sent: Wed, 29 Nov 2006 12:08:21 +0100
From: Peter Dalgaard <[EMAIL PROTECTED]>
To: Wolfram Fischer <[EMAIL PROTECTED]>
Copies to: r-help@stat.math.ethz.ch
Subject: Re: [R] Why the factor levels returned by cut() are not
ordered?
> Wolfram Fischer wrote:
> > What is the reason, that the levels of the factor
> > returned by cut() are not marked as ordered levels?
> >
> >
> >> is.ordered( cut( breaks=3, sample(10 ) ) )
> >>
> > FALSE
> >
> >
> It would arguably be the Right Thing, but there would be complications
> in modeling, where ordered factors result in polynomial contrast
> coding. (This, in my opinion, is a design mistake inherited from S,
> but it's not easy to change at this stage.)
Well
what about to change cut.default
if (codes.only)
code
else factor(code, seq(labels), labels)
to
if (codes.only)
code
else factor(code, seq(labels), labels, ...)
which enables to use ordered switch
> is.ordered( cut( breaks=3, sample(10 ), ordered=T ) )
[1] TRUE
Without this the result is same as before (I believe :-)
Petr
>> help(factor) >> >
> ... > If 'ordered' is 'TRUE', the factor levels are assumed to
> be ordered. > ... > > Wolfram > >
> ______________________________________________ >
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>
>
> --
> O__ ---- Peter Dalgaard Řster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen Denmark Ph: (+45)
> 35327918
> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45)
> 35327907
>
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Petr Pikal
[EMAIL PROTECTED]
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