Good morning - thanks for your question. The Regression node does not support that feature. However, PROC HPGENSELECT, available last June, does. In EM 13.1, available in just a few weeks (mid-December), there will be a new node, the GLM node, which will enable you to specify your reference levels for each class variable. Please consider speaking with the SAS representative at your organization about updating your license; EM 7.1 goes back quite a number of years and there is much additional functionality in the current releases.
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