Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: RE: Chemometrics functions


From   James Hardy <jkh@uakron.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: Chemometrics functions
Date   Mon, 16 Dec 2002 13:37:07 -0500

For PCR, the major difference would be having the ability to develop an
optimum model using cross validation.


On 12/16/02 1:16 PM, "Nick Cox" <n.j.cox@durham.ac.uk> possibly may have
written:

> 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

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index