[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
RE: st: RE: Chemometrics functions
> On 12/16/02 1:16 PM, "Nick Cox" <email@example.com>
> possibly may have written:
> > I don't know about partial least squares.
> > I dimly recall one user-programmer getting
> > interested in it some years ago, but I won't
> > name names just in case the project got
> > nowhere, or was private, or I'm mistaken.
> > You get principal components from -factor-.
> > It would be easy enough to automate putting
> > them into a regression. On the other hand,
> > it may be that there is more to principal
> > components regression than calculating PCs
> > and using them as predictors in a regression,
> > which is what I'm assuming.
> For PCR, the major difference would be having the ability
> to develop an
> optimum model using cross validation.
Yes; I wrote that with probability 1.
The cross-validation I think you would need
to write yourself.
* For searches and help try: