[R] Question on lda and predict

From: Peter Flom <peterf_at_brainscope.com>
Date: Tue, 10 Jun 2008 08:01:45 -0700


Using R 2.7.0 on Windows.

I am running a linear discriminant analysis as follows

discrim1 <- lda(normvar~ mafmahal+ mrfmahal+ mffmahal+ bafmahal+ brfmahal+

      cofmahal+ bmfmahal+ cfmahal+ fractmahal+ antmahal+ absmifmahal+ absifmahal, subset = train) prediction <- predict(discrim1, traintest1[-train,])$class

When I do this, I get a warning message:

Warning message:
'newdata' had 795 rows but variable(s) found have 796 rows

However, when I look at 'newdata' (i.e. traintest1) with dim, I find it has 796 rows:

> dim(traintest1)
[1] 796 612

So, I do not understand the warning.

Thanks for any explanation or assistance

Peter L. Flom, PhD
Brainscope, Inc.

212 263 7863 (MTW)
212 845 4485 (Th)
917 488 7176 (F)

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