Size Does Matter: Global Control Group for a Bank
Too Long; Didn't Read
A CRM team at a large retail bank had a constant dispute about how much such activities bring to the bank in total. To answer those questions, we proposed a so-called **global control group** (let's call it GCG here and below, too) - a group of clients that would be frozen for a year from any contacts from our side. The technique explained below may be applied to select an ordinary control group.