Implement the Buy Till you Die Model,  BG&#x2F;BB, BG&#x2F;NBD and Pareto&#x2F;NBD models, which capture&#x2F;project
customer purchase patterns in a typical non-contractual setting.<p>You can implement this in excel using the instructions in the link
<a href="http:&#x2F;&#x2F;brucehardie.com&#x2F;notes&#x2F;010&#x2F;bgbb_spreadsheet_2011-01-20.pdf" rel="nofollow">http:&#x2F;&#x2F;brucehardie.com&#x2F;notes&#x2F;010&#x2F;bgbb_spreadsheet_2011-01-20...</a>