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Table 2 Confusion matrix

From: Automatic identification of inertial sensor placement on human body segments during walking

a

b

c

d

e

f

g

h

i

j

<— classified as

30

0

1

0

0

0

0

0

0

0

a

Pelvis

0

25

0

6

0

0

0

0

0

0

b

Sternum

1

0

30

0

0

0

0

0

0

0

c

Head

0

1

0

61

1

0

0

0

0

0

d

Shoulder

0

0

0

0

61

0

0

0

0

0

e

Upper arm

0

0

0

0

0

62

0

0

0

0

f

Forearm

0

0

0

0

0

3

59

0

0

0

g

Hand

0

0

0

0

0

0

0

62

0

0

h

Upper leg

0

0

0

0

0

0

0

0

62

0

i

Lower leg

0

0

0

0

0

0

0

0

0

62

j

Foot

  1. Resulting from testing the decision tree in Figure 2 with 10-fold cross-validation, using 31 walking trials. From the (31 ·17=)527 inertial sensors, 514 were correctly classified (97.5%).