topic Re: sas pls in Statistical Procedures

SAS PLS procedure output data

variety — Thu, 27 Jul 2017 18:47:06 GMT

I am using sas 9.3 version. In the out model data set from proc pls procedure, what does the letters 'WB', 'PQ' and 'V' mean?

Re: sas pls

PaigeMiller — Thu, 27 Jul 2017 18:35:05 GMT

I'd say its impossible to answer that question unless you show us your code.

Re: sas pls

ChrisHemedinger — Thu, 27 Jul 2017 18:44:16 GMT

I think these are TYPE values indicating various coefficients, which you can then use for post processing. You might glean more from this paper about using PROC PLS.

Re: sas pls

variety — Thu, 27 Jul 2017 18:56:05 GMT

I read that paper before posting the question. I still couldn't understand the full form of WB, PQ and V. The best I can find is:

"standard PLS model parameters, WB contains W and B,

PQ contains P and Q, and V contains the proportion of variability explained."

Thanks.

Re: sas pls

PaigeMiller — Thu, 27 Jul 2017 20:25:19 GMT

For the 2nd time, I request that you please show us your code.

Also, you state

"standard PLS model parameters, WB contains W and B, PQ contains P and Q, and V contains the proportion of variability explained."

Where do you see this? It is not in the linked article about PLS

Re: sas pls

variety — Thu, 27 Jul 2017 22:01:17 GMT

SAS Code:

proc pls data=problem cv=one details censcale plots=all outmodel=est1;
model Y=X1-X16/solution;

run;

proc print data=est1;

run;

In the est1 ouput I get Obs, _LV_, TYPE

In the TYPE, I get WB, PQ, V, V.

I know W means Weights and B means beta coefficients. I am just trying to double check.

the answer I posted is not from the article. It is from a quick google search.

Re: sas pls

PaigeMiller — Thu, 27 Jul 2017 23:19:44 GMT

The SAS documentation that I have does not show any such option named OUTMODEL in the PROC PLS statement.

http://documentation.sas.com/?cdcId=statcdc&cdcVersion=14.2&docsetId=statug&docsetTarget=statug_pls_syntax01.htm&locale=en

the answer I posted is not from the article. It is from a quick google search.

Please give us the link so we can all see what you are seeing

Re: sas pls

variety — Fri, 28 Jul 2017 02:34:53 GMT

I don't know why your documentation doesn't contain OUTMODEL statement. There is an entire section dedicated in SAS 9.3 user guide to describe the OUTMODEL function. You can check it on page 1180 on SAS 9.3 user guide here. https://support.sas.com/documentation/cdl/en/statug/63962/PDF/default/statug.pdf

The link I was telling you about is here: http://comp.soft-sys.sas.narkive.com/2LXXqkjw/pls-procedure-outmodel

Proc PLS procedure contains OUTMODEL function. OUTMODEL creates an output data set that contains the model information for the analysis, the parameter estimates, and their standard errors.

Re: sas pls

PaigeMiller — Fri, 28 Jul 2017 11:53:39 GMT

Your link to documentation showing OUTMODEL on page 1180 refers to PROC CALIS and not PROC PLS. So I don't see how it is relevant at all.

Your other link to the comp.soft-sys.sas archive seems to be referring to version SAS 6.11 which did have an outmodel option, again not relevant here, although it's good to see I was replying to this question back in 2006, and giving the same answer.

But all of this won't get us anywhere. The PROC PLS OUTMODEL option, if it exists, is currently undocumented, and so only people at SAS can tell you what it does and what it means, outsiders like me cannot possibly know what it does.

You don't need this mysterious OUTMODEL option anyway. If you want to save the results of your PLS model fit into SAS data sets, it can all be saved using ODS OUTPUT, which is what I do. All of the options available to save the results of PROC PLS via ODS OUTPUT are given here: http://documentation.sas.com/?cdcId=statcdc&cdcVersion=14.2&docsetId=statug&docsetTarget=statug_pls_details11.htm&locale=en

And here's the main benefit: if you use ODS OUTPUT, then everything is documented and explainable.