>>>>> "Pieter" == Pieter Vermeesch <[EMAIL PROTECTED]>
>>>>> on Mon, 16 Oct 2006 19:15:59 +0200 writes:
Pieter> I'm trying to do a linear discriminant analysis on a
Pieter> dataset of three classes ("Affinities"), using the
Pieter> MASS library:
^^^^^^^
No, no! MASS *package* (please!)
>> data.frame2 <- na.omit(data.frame1)
>>
>> data.ld = lda(AFFINITY ~ ., data.frame2, prior = c(1,1,1)/3)
Pieter> Error in var(x - group.means[g, ]) : missing observations in cov/cor
Pieter> What does this error message mean and how can I get rid of it?
You have (+ or -) 'Inf' data values which na.omit() does not
omit and 'x - group.means[g, ]' contains 'Inf - Inf' which is NaN.
Ideally, MASS:::lda.default() would check for such a case and
give a more user-friendly error message.
Pieter> Thanks!
you're welcome.
Martin Maechler, ETH Zurich
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