Hello,
SAS Visual Statistics 8.3: Procedures The TREESPLIT Procedure Details : Variable Importance https://go.documentation.sas.com/doc/en/casstat/8.3/casstat_treesplit_details20.htm
Example 21.3 Assessing Variable Importance https://go.documentation.sas.com/doc/en/casstat/8.3/casstat_treesplit_examples04.htm
I have never looked at the absolute figure(s) for Variable Importance. Use the Relative Importance instead. Variables that are NOT used have an importance of zero. The most important variable has an importance of one. All other variables are scaled in between (in between 0 and 1).
Thanks, Koen
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