Figure 2: as a function of σa0 under the normalized power prior (NPP) when D under the normalized power prior (NPP) when D = D0. Current data sample sizes are (a) n = 1, (b) n = 2, (c) n = 10, and (d) n = 100. Each plot presents trends when historical sample sizes are inflated by factors of 1 (solid), 2 (dashed) and 5 (dotted). The fi gures suggest that, unlike the IC power prior, the NPP is relatively invariant to changes in n and n0 when the data are identical.