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Table 4 Degree of accuracy for different sensor combinations at all 3 levels of classification—with transitions

From: Development of a Human Activity Recognition System for Ballet Tasks

 Level 1Level 2Level 3
Number of sensors (number of possible sensor combinations)Accuracy score mean (range)BestWorstAccuracy score mean (range)BestWorstAccuracy score mean (range)BestWorst
5 (6)84% (83.6–84.4%)L shin
L thigh
R shin
R thigh Thoracic
L thigh
L shin
R thigh
Sacrum
Thoracic
76.2% (75.9–76.6%)L shin
L thigh
R shin
R thigh
Thoracic
L shin,
L thigh
R shin
R thigh Sacrum
73.6% (73.2–74%)L shin
L thigh
R shin
R thigh Sacrum
L shin
L thigh
R shin
R thigh Thoracic
4 (15)83.4% (82.5–84.0%)L shin
R shin
R thigh
Sacrum
L shin
L thigh
Sacrum
Thoracic
75.3% (74.5–75.9%)L shin
R shin
R thigh
Thoracic
L shin
L thigh Sacrum Thoracic
73.0% (71.5–74%)L shin
L thigh
R shin
R thigh
L shin
L thigh
Sacrum Thoracic
3 (20)82.9% (82.1–83.6%)L shin
R shin Thoracic
L shin
L thigh
Sacrum
73.9% (70–75.4%)L shin
R shin
Sacrum
L shin
L thigh Thoracic
71.6% (67.1–73.3%)L shin
R shin
R thigh
L shin
L thigh Thoracic
2 (15)82.1% (81.2–82.9%)L shin
R high
L shin
Thoracic
71.2% (67.3–74.4%)L shin
R thigh
L shin
Thoracic
68.5% (64–71.8%)L shin
R thigh
L shin
Thoracic
1 (6)80.6% (78.0–81.6%)R thighThoracic64.7% (58.5–70%)SacrumThoracic61.0% (47.4–67%)SacrumThoracic