RE: [R] Mass: lda and collinear variables

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From: Adaikalavan Ramasamy (gisar@nus.edu.sg)
Date: Mon 24 Feb 2003 - 16:35:14 EST


Message-id: <024D6AEFCB92CB47BA1085751D184BB801053F28@MBXSRV03.stf.nus.edu.sg>

What is the dimension of your data. i.e. how many observations and how many variables do you have?

-----Original Message-----
From: Till Baumgaertel [mailto:till.baumgaertel@epost.de]
Sent: Monday, February 24, 2003 9:41 AM
To: r-help@stat.math.ethz.ch
Subject: [R] Mass: lda and collinear variables

hello list,

when I use method lda of the MASS package I experience a warning: variables are collinear in: lda.default(data[train, ], classes[train])

Is there an easy way to recover from this issue within the MASS package? Or how can I tell how severe this issue is at all?

I understand that I shouldn't use lda at all with collinear data and should use "quadratische" (squared?) discr. analysis (by Welch) instead. Or is this wrong? Could I do this in R?

Thanks four your help,
Till Baumgärtel

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