Differential Analysis Screen is not populating

Document ID : KB000117379
Last Modified Date : 11/10/2018
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Issue:
The differential analysis screen appears but is not being populated  Why is this?
Environment:
APM 10.7 
Cause:
Variance.DB file not created on all collectors. 
Resolution:
Make sure that 
introscope.enterprisemanager.baseline.database

is uncommented and set to a valid location on all the Enterprise Managers in the cluster. You need a variance.db file created on all active EMs to have differential analysis.