Figure 4
From: Forecasting product sales with a stochastic Bass model
Confidence intervals for yearly sales with past and future separated by the vertical solid line \(t = 19\) (future data unknown): (a) The function \(y(t)\) satisfying (1) and (10) is given by the solid curve fitting the data (●) for \(t \leq 19\). (b) The boundaries of the 95% confidence region (dashed) satisfying (9)–(11)