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. 2011 Aug 5;6(8):e23080. doi: 10.1371/journal.pone.0023080

Table 1. Step features.

Feature Computation MA-model C-model Energy-model RBWE-model
Minimum Inline graphic
Maximum Inline graphic ✓ (y)
Mean Inline graphic ✓ (z, e) ✓ (e)
Sum Inline graphic ✓ (x, z)
Sum of absolute values Inline graphic ✓ (y, z) ✓ (x, y, z) ✓ (z)
Range Inline graphic
Step duration Inline graphic ✓ ✓
Root mean squared (RMS) Inline graphic ✓ (x, z, e) ✓ (z)
Maximum-mean Inline graphic (x) ✓ (x) ✓ (x)
Step amplitude Inline graphic ✓ (x) ✓ (x)
Min/max amplitude duration

Characteristics calculated for each detected step Inline graphic consisting of Inline graphic values Inline graphic. Each of the features listed above (except for the step duration) was computed for each axis Inline graphic, Inline graphic, Inline graphic as well as for the energy Inline graphic derived from the actibelt® signal which results in a total of 41 features. The columns three to six indicate which features and axes were used for the respective models.