Subject: Re: [R] lev in smooth.spline
From: Prof Brian D Ripley (ripley@stats.ox.ac.uk)
Date: Fri 12 May 2000 - 21:43:21 EST
Message-ID: <Pine.GSO.4.05.10005121238210.13117-100000@auk.stats>
On Fri, 12 May 2000, Damien BERLEMONT wrote:
> ** High Priority **
>
> Dear R users,
>
> I am new in the cubic smoothing spline issues, consequently my question
is about the smooth.spline function in the modreg package :
I would like to know if the value of *$lev is the eigen decomposition
of the smoother matrix or only the diagonal values of the smoother matrix ?
If second choice, how can I have the smoother matrix S defined by :
fitted vector = S %*% vector to be smoothed ?
>
> Thanks in advance for all R users that could answer me
You could answer it for yourself by looking at the help page(!):
lev: leverages, the diagonal values of the smoother matrix.
or at the code. You can of course find the smoother matrix by predicting
some basis vectors, the absolutely standard technique in the smoothing
field.
> Damien Berlemont
> Student in statistics in the University of Paris-X
> Damien.Berlemont@ccf.fr
>
[ Nonsense about `This message is strictly confidential' deleted. ]
-- Brian D. Ripley, ripley@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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