We can further see how the penetrances differ by looking at the slope of the trend in each bin. Apparently as the value of R increases across the bins, the slope of the trend also increases. This is because when R is high (such as 0.9 and 1.0), the same degree of lift in the penetrances will add more power and move/more quickly to its next level compared to the situation when R is low (such as 0.5). From another point of view, we can imagine these slopes as the (first) derivatives of a convex function in terms of R. On this convex curve, as R moves along to its rightmost end (increases), the derivative of the function increases and the function value (power) improves faster.
