From berwin at maths.uwa.edu.au  Fri Nov  4 08:45:53 2005
From: berwin at maths.uwa.edu.au (Berwin A Turlach)
Date: Fri, 4 Nov 2005 15:45:53 +0800
Subject: [Rd] small bug in gl1ce, package lasso2 (PR#8280)
In-Reply-To: <20051104055212.50C0922141@slim.kubism.ku.dk>
References: <20051104055212.50C0922141@slim.kubism.ku.dk>
Message-ID: <17259.4529.335046.34815@bossiaea.maths.uwa.edu.au>

>>>>> "BDR" == ripley  <ripley at stats.ox.ac.uk> writes:

    BDR> Please do read the FAQ:

    BDR> Finally, check carefully whether the bug is with R, or a
    BDR> contributed package.  Bug reports on contributed packages
    BDR> should be sent first to the package maintainer, and only
    BDR> submitted to the R-bugs repository by package maintainers,
    BDR> mentioning the package in the subject line.

And Brian forgot to point out that you should probably not file a bug
report on your bug report since somebody has to clean up after you. :)
Now there is PR#8279 and PR#8280 to deal with, the second one should
have been a follow up for the first.

    BDR> You are not the maintainer, so this is the wrong place.
Well, I am not the maintainer either, but just a short note:

You should read the documentation of the argument 'standardize', whose
default is TRUE:

standardize: logical flag: if 'TRUE', then the columns of the model
          matrix that correspond to parameters that are constrained
          are standardized to have empirical variance one.  The
          standardization is done after taking possible weights into
          account and after sweeping out variables whose parameters
          are not constrained.

If you have a constant term in your model, then you can not
standardize it.  So if you set 'sweep.out' to NULL and have a constant
term in your model, then you should set standardize to FALSE.  If you
still want to standardize your non constant regressor variables, then
you have to do it yourself and pass the variables as you want them to
gl1ce.

IMO, there is no bug here, the functions were designed to work in this
way.

Cheers,

        Berwin

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[Rd] small bug in gl1ce, package lasso2 (PR#8280)
Berwin A Turlach