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FIGURE 7 Mean pme vs mean bit rate using the personal gold standard. The dotted, dashed, and dash-dot curves are quadratic splines fit to the data points for judges 1, 2, and 3, respectively. The solid curve is a quadratic spline fit to the data points for all judges pooled.

pooled are the measurements from all judges, images, levels, and vessels, with each judge's measurements compared to her or his personal gold standard. In each case, quadratic splines with a single knot at 1.0 bpp were fit to the data. Figs 9 and 10 are the corresponding figures for the apme. As expected, with the personal gold standard the pme and the apme are less than those obtained with the independent gold standard. The graphs indicate that whereas both judges 2 and 3 overmeasured at all bit rates with respect to the independent gold standard, only

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