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Combining several variable selection techniques in Enterprise Miner

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New Contributor
Posts: 3

Combining several variable selection techniques in Enterprise Miner

Hi there,

I'm using Enterprise Miner 5.3 and am trying to combine the results of several variable selection techniques into a larger pool of "good" variables. I'm using the Decision Tree, Regression and Variable Selection nodes to flag variables as Rejected. What I want is to combine all variables that are not rejected in either or all of the three nodes.

Originally I used the Drop node to drop all Rejected variables for each technique and then used the Merge node to combine the remaining variables into a pool to be used for further modeling. This seems to work fine, as evidenced by the succesful running of the Model Comparison node, however it all goes haywire when I try to combine some of my models with the Ensemble node. It then complains with the following warning (and ensuing errors): "WARNING: Apparent symbolic reference EM_SCORE_OUTPUT not resolved." (Log attached)

1) Does anybody have any idea what causes the error?

2) Am I doing the merging wrong? Is there a better way?

Thank you for your time,

Tijl Kindt

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SAS Employee
Posts: 122

Re: Combining several variable selection techniques in Enterprise Miner

Hi, Tijl,

This TS note appears to address your issue with EM 5*x. There is a hot fix there. The root cause is the Merge Code.

Problem Note 19447: Incorrect Score Code generated from Merge node

Jason Xin

New Contributor
Posts: 3

Re: Combining several variable selection techniques in Enterprise Miner

Hmm... Thanks for the reply.

This webpage claims the bug was reported in 5.2 and should be fixed in 5.3, right? So in theory, I shouldn't be getting this error, right?

19447 - Incorrect Score Code generated from Merge node

SAS Employee
Posts: 68

Re: Combining several variable selection techniques in Enterprise Miner

Hi at this point I would recommend working with SAS Tech Support.  They are an excellent resource for issues like this, and can provide 1:1 support and solutions. 

You can open a track with Technical Support. For information on other ways to contact Tech Support, refer to: http://support.sas.com/techsup/contact/index.html.


Thanks!

Jonathan

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