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Use of 'boosting' in CHAID causes error

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Question by Mauricio Cornejo  (479) | Feb 02, 2016 at 10:34 AM spssmodeler

Using a CHAID model on a flag target, enabling boosting to enhance model accuracy (while all other parameters are set to their defaults) results in the following execution error: "Warning: Error: Field $R1-Target has an incorrect storage type in the data model."

Model runs fine without boosting and $R1-Target seems like an internally calculated field ... so I don't understand what's going on.

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Answer by Mauricio Cornejo (479) | Feb 04, 2016 at 02:32 PM

I raised an issue with Technical Support. Turns out it is a bug when CHAID is used from auto-classifier. There is an interim fix.

I'm running Modeler 17 with Fix Pack 1 (i.e. 17.0.0.1) and the link I was sent for applying IF020 is

http://www-933.ibm.com/support/fixcentral/swg/quickorder?parent=SPSS&product=ibm/Information+Management/SPSS+Modeler&release=All&platform=All&function=fixId&fixids=17.0-IM-S17MODELERC-WIN64-FP01-IF020:0&includeSupersedes=0&source=fc&login=true

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Jared Peterson

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2700073SYE gravatar image Jared Peterson (320) ♦   Feb 09, 2016 at 09:47 AM 0
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For anyone that thinks they are hitting this issue, log a ticket with technical support. We can help you verify you are experiencing the defect, then give you access to the fix Mauricio noted above.

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Answer by Kenneth Jensen (IBM) (2577) | Feb 03, 2016 at 12:05 PM

This does not look like an error or warning that I have seen before and I think that you are correct in your suspicion that the $R1-Targetis an internally calculated field; probably related to the first of the component models estimated as a part of the boosting.

I would suggest that you contact our Technical Support to open a PMR for them to investigate this error.

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Mauricio Cornejo

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