Posted by
Feinstein, Zachary on
Jun 30, 2006; 3:38pm
URL: http://spssx-discussion.165.s1.nabble.com/pls-regression-tp1069413p1069414.html
Now the big question is... Can PLS be done with SPSS as easily as it
can with SAS? If so, would anyone have any code to send along?
Zachary
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
vlad simion
Sent: Friday, June 30, 2006 8:49 AM
To:
[hidden email]
Subject: Re: pls regression
Thank you very much!
Vlad.
On 6/30/06, Dan Zetu <
[hidden email]> wrote:
>
>
> Vlad,
>
> PLS is best suited for the case when you have many variables and small
> sample sizes and does not assume multivariate normality. It does also
> have an intrinsic way of dealing with multicollinearity by explaining
> both the covariance among the IVs and the association between IVs and
DVs.
>
> But, if you have a lot of missing data, a Chaid-type analysis may be
> more appropriate for your case.
>
> Dan
>
> >From: "vlad simion" <
[hidden email]>
> >To: "Dan Zetu" <
[hidden email]>
> >CC:
[hidden email]
> >Subject: Re: pls regression
> >Date: Fri, 30 Jun 2006 09:39:53 +0300
> >
> >Thank you all,
> >
> >I think I am a little bit confused and I am not sure I really know
> >what
> is
> >appropriate for what I need.
> >I have some data with a lot of missings where the independent
> >variables
> are
> >highly correlated and as far as I understand the PLS regression
> >(partial least squares - if I get it right) would be more fitted than
> >multivariate regression or GLM, because of the multicolinearity.
> >I hope it cleares a little what my problem is, because for me....
> >
> >Thank you again.
> >
> >Vlad.
> >
> >
> >On 6/29/06, Dan Zetu <
[hidden email]> wrote:
> >>
> >>First, I am not aware of any SPSS capability to do PLS regression.
> >>SAS
> has
> >>proc pls that does PLS regression, not to be confused with the PLS
> >>approach for latent variable modeling. If you have SAS, then its
> >>documentation
> has
> >>a
> >>rather good description of the procedure and what it does.
> >>
> >>Although I personally haven't seen one, any chemometrics book should
> >>contain at least some brief description of the PLS regression
> >>procedure, as it
> is
> >>this field in which PLS has found many applications. Also, SAS
> researchers
> >>have published papers in the past on PLS regression (they should be
> >>publicly available on SAS website).
> >>
> >>Hope this helps,
> >>
> >>Dan
> >>
> >>
> >> >From: vlad simion <
[hidden email]>
> >> >Reply-To: vlad simion <
[hidden email]>
> >> >To:
[hidden email]
> >> >Subject: pls regression
> >> >Date: Thu, 29 Jun 2006 09:15:49 +0300
> >> >
> >> >Hi all,
> >> >
> >> >could anyone help me with some clearings on the PLS Regression,
> >> >the algorithm, what are the assumptions for running it and so on.
> >> >And
> where
> >>can
> >> >I find some materials on pls regression?
> >> >
> >> >Thank you in advance.
> >> >
> >> >Vlad.
> >> >
> >> >--
> >> >Vlad Simion
> >> >Data Analyst
> >> >Tel: +40 720130611
> >>
> >>
> >>
> >
> >
> >--
> >Vlad Simion
> >Data Analyst
> >Tel: +40 720130611
>
>
>
--
Vlad Simion
Data Analyst
Tel: +40 720130611