R help - Jul 2004 - lda() - again.

Hi.

I asked a question about lda() and got some answers. However, one 
question remains (which is not independent of the earlier ones):

What output does lda() produce which I can use to compute the
posteriors? I know predict(lda())$posterior will give me precisely the
posteriors, but suppose I'd like to compute them myself, outside
of R. 

So far, I have not been able to use "coefficients of linear 
discrimiants" to do this, for they don't seem to be the alpha and beta
in     log(post) ~ alpha x + beta  (this eqn being a caricature of 
LDA in Ripley).

Caren
-- 
http://www.nhn.ou.edu/~marzban

I remember doing this some time ago but forgot. Perhaps this might help
you

 MASS:::predict.lda


On Tue, 2004-07-13 at 23:56, marzban wrote:
> Hi.
> 
> I asked a question about lda() and got some answers. However, one 
> question remains (which is not independent of the earlier ones):
> 
> What output does lda() produce which I can use to compute the
> posteriors? I know predict(lda())$posterior will give me precisely the
> posteriors, but suppose I'd like to compute them myself, outside
> of R. 
> 
> So far, I have not been able to use "coefficients of linear 
> discrimiants" to do this, for they don't seem to be the alpha and
beta
> in     log(post) ~ alpha x + beta  (this eqn being a caricature of 
> LDA in Ripley).
> 
> Caren