Figure 6

Discriminating power of the statistics D , K and S for human pulse waveforms. The distribution (a binned histogram) of statistic values estimated via the ATS method (as described in figure 5) for each of the four distinct physiological waveforms is shown. The four rhythms correspond to those in Figure 4. These figures show that correlation dimension alone is sufficient to differentiate between three of these four physiological states: on the left, "post-operative" and "quasi-stable" are indistinguishable, the correlation dimension for "normal" is bigger, and "unstable" is larger again We see that these three statistics are insufficient to differentiate between the "quasi-stable" and "post-operative" states, moreover, there is considerable overlap with the "normal" group.