[R] Mass: lda and collinear variables

Till Baumgaertel till.baumgaertel at epost.de
Mon Feb 24 02:42:02 CET 2003

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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