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Distribution of the difference in the average performance of the Kalman Filter (KF) and the average performance of the Wiener Filter (WF) for all written characters across subjects. Statistical Difference between the average KF and the average WF performance is measured by one-sided Wilcoxon matched-pair test for X-coordinate, Y-coordinate and the average of the two, i.e., (X+Y)/2: **significantly greater than zero at 1% significance level.
