Figure 3.

Sample Entropy calculation. For each pattern of m points in trunk acceleration signal, places in other parts of the signal where the template is seen are identified within tolerance r. Sample Entropy is calculated as the negative natural of the conditional probability that the pattern of m + 1 points will match if that the pattern of m points did match. After the signal matched the first two parts of the pattern m, this is the probability that pattern match will complete, m + 1. The number of m matches are compared to the number of complete pattern (m + 1) matches.