Why Tableau Toggle sub-navigation. What Is Tableau; Build a Data Culture; Tableau Economy; The Tableau Community; The Salesforce Advantage; Our Customers; ... The Top 3 Concentration Index by id_supplier must be computed as ((102+23+2353) + 2353 + 253 )/((102+23+2353) + 2353 + 253 +21) Thank you in advance . Expand Post.