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2009 Dec 03
2
Avoiding singular fits in rlm
I keep coming back to this problem of singular fits in rlm (MASS library),
but cannot figure out a good solution.
I am fitting a linear model with a factor variable, like
lm( Y ~ factorVar)
and this works fine. lm knows to construct the contrast matrix the way I
would expect, which puts the first factor as the baseline level.
But when I try
rlm( Y ~ factorVar)
I get the message "'x' is singular: singular fits are not implemented in
rlm."
How can I solve this probl...