Hello, I have run a linear discriminant analysis for the simple 2 group case
using the MASS package lda() function. With priors fixed at 0.5 and unequal n
for each group, the output basically provides the group means and the LD1
value. There is no automatic output of the cutoff (decision boundary) value
used to classify values of the response variable into the different groups. I
have tried various unsuccessful approaches to extract this value. It is
obvious that in the simple 2 group case the value will be close to the mean of
the 2 group means and that the LD1 value is involved (perhaps grand mean *
LD1?). I am probably missing (misunderstanding?) the obvious and would
appreciate being educated in this matter. Thanks. Regards,BJ
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