Youâ€™ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract A Priest, a Rabbi And a Data Scientist Walk Into a Bar â€¦ In This Era of Arbitrary Measurements and Self-Reported Metrics, What's a Media Buyer to Believe, Anyway? By Simon Dumenco, Published on January 06, 2014 5 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.