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WY
‎09-01-2015
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Re: A question about the "Use Multiple Targets" in SAS EM Decision Tre...

by Calcite | Level 5 in SAS Data Science
‎10-10-2013 04:12 PM
‎10-10-2013 04:12 PM
Hi, Jonathan: Thank you very much for your reply ! I have read the EM User Guide, and have performed several experiments. For now, my understanding are: 1. The property : "Multiple Targets" is only useful when users run "interactive decision tree" since they can "switch target" at any time. For a auto-fitted decision tree, "Multiple Targets" has no impact at all -- users have to explicity specify only one variable to be used as the target by change its "Use" property to "YES" in the "Edit Variable" contect menu. 2. If users have multiple targets and want to check the input facts' impact on each of them, they may use "Start Group" and "End Group" modules to realize such a goal. The "decision tree" module does not fit to more than one target variable in one run. I will appreciate it if you can make a comment or correct my understandings. Thanks. ... View more

A question about the "Use Multiple Targets" in SAS EM Decision Tree

by Calcite | Level 5 in SAS Data Science
‎09-24-2013 03:46 PM
‎09-24-2013 03:46 PM
Hello, everyone. As a new user to SAS EM, I am trying to use the Decision Tree in SAS EM 12.1 on a prediction project, in which a bunch of facts (system status) are input to predict the performance of the system (measured in three Key Performance Indicators (KPI) ). So far I have created a Decision Tree model and obtained some good preliminary results. However, I found I am confused about the "Use Multiple Targets" setting in the "Decision Tree" module. My question is -- Does the "Multiple Targets" refers to multiple target variables/columns in the data source (e.g., I have 3 KPIs, which are all set to Target so that they will be predicted); multiple levels of one specific target, which can be chosen insides the "Edit variables ..." of the Desision Tree module and set the "Use" of one target to Yes and others to No My guess is the second since if I set the "Use Multiple Targets" to NO, then the generated decision tree will only split once then stop. In contrast to if I set the "Use Multiple Targets" to Yes, then the decision tree will split for several layers. I am not sure if my guess is correct or not, and wish someone experienced can help confirm/correct me. Thanks, ... View more
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