Right. The only question left - how I can do this in S-Plus/R... Radford Neal wrote: > In article <aro9ud$e51$[EMAIL PROTECTED]>, > Alexander Sirotkin <[EMAIL PROTECTED]> wrote: > > >>I use princomp() to get a PCA components and then use these components >>to build a classification model. >> >>When I use new data with that model (data which I did not have when >>I did the original PCA), I have to aplly a PCA first and then use PCA >>components with my model. >> >>The problem is - I would like (actually, I think I have) to use an >>eigenbasis from the first PCA when I do a PCA on a new data. >> >>So the question is - how can I use the eigenbasis (loadings ??) from >>princomp() output as an argument to another princomp() when processig a >>new data. > > > You probably want to just find the projections of the new data on the > principle components you found before, which I presume are the inputs > to your classification model. I think you don't want to find principle > components all over again. > > Radford Neal
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