Figure 4: as a function of under the NPP as the current and historical data diverge. For figure (a), n = n0 = 100; for figure (b), n = 2, 536 and n0 = 895, corresponding to the sample sizes for the case study presented later. For both figures, σ2 = 1, = 0, µa0 = 0.50, and y ranges from 0 to 1.0, refl ecting increasing disparity between the current and historical data. As and increase, the historical data are substantially downweighted.