Activity Prediction or Classification Using PCA

I am curious to learn how PP users employ PCA to create activity prediction of classification models.

For example, take a look at the PP protocols, "01 Learn PCA Model from Asinex," and "02

Use PCA Model and Scatter Plots to View Activity Classes."  Aside from the resulting

visualization in step # 02, how does oneactually use the generated model to predict whether

or a molecule not in the trainingset is an estrogen antagonist, prostaglandin, MAO inhibitor, or none of these?

Once the PCA model is created, one can read in molecules not in the training set and obtain

PCA coordinates, but how then to process this information?  How does one make a classification

or an activity prediction using the PCA coordinates.

I welcome comments, suggestions, user experiences, references to publications, etc.

Regards,

Jim Metz

James.Metz@AbbVie.com