BG                      Beta Geometric (BG) Model for Projecting
                        Customer Retention.
BdW                     Beta discrete Weibull (BdW) Model for
                        Projecting Customer Retention.
LCW                     Latent Class Weibull (LCW) Model for Projecting
                        Customer Retention
customer_retention      Observed % Customers Surviving at Least 0-12
                        Years
exltrend                Excel based trendlines for projecting customer
                        retention.
persistency_data        Drug persistency (retention) rates by different
                        therapeutic class.
