This is not an R question. Post it on a statistics site like stackexchange,
instead.

http://stats.stackexchange.com/

-- Bert

On Fri, Sep 23, 2011 at 9:49 AM, B Jessop <deelman@hotmail.com> wrote:

>
>
>
>
> 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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>
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-- 
"Men by nature long to get on to the ultimate truths, and will often be
impatient with elementary studies or fight shy of them. If it were possible
to reach the ultimate truths without the elementary studies usually prefixed
to them, these would not be preparatory studies but superfluous diversions."

-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics

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