FIGURE 2.

Example of performance of the VT method. (a) The total steps found in the record being analyzed varies significantly as the threshold is increased. The graphs for VT method (window of 13) for SD1, 3, and 5 noise are shown. The plateau in the graphs is generally close to the optimal choice for the threshold. Note, however, that the plateau loses its definition at higher noise, making setting of the threshold difficult. (b) Three performance characteristics are shown for various choices of window size at SD3 noise for the VT method. For each window size, the threshold was found following rules described in the text for each of three runs and the mean and SD are plotted here. Percent Found and Correct remain stable across a wide variation in rank/window size. The Percent 8's decreases with increasing window size. As a result, mean performance (mean of all three parameters) also drops with increasing window size.