Plots and returns the estimated gamma distribution of p (customers' probability of dropping out immediately after a transaction).
BG/NBD parameters - a vector with r, alpha, a, and b, in that order. r and alpha are unobserved parameters for the NBD transaction process. a and b are unobserved parameters for the Beta geometric dropout process.
upper-bound of the x-axis. A number is chosen by the function if none is provided.
Distribution of customers' probabilities of dropping out.
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