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st: RE: Chemometrics functions


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Chemometrics functions
Date   Mon, 16 Dec 2002 18:16:44 -0000

James Hardy (ASCII version) 

> I was wondering if anyone was aware of any Chemometrics 
> related functions for Stata.  Specifically routines for 
> building models and making predictions using partial 
> least squares regression (PLS) or principal component 
> regression (PCA).

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. 

Nick
n.j.cox@durham.ac.uk 
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