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Table 4 Comparison of joint torque estimation for models trained with two, five, and eight SEMG channels.

From: Comparison of regression models for estimation of isometric wrist joint torques using surface electromyography

Model

8 channels

5 channels

2 channels

  

NRMSE

R a 2

NRMSE

R a 2

NRMSE

R a 2

PBM

Mean

2.73%

0.85

3.07%

0.86

4.59%

0.77

 

STD

0.97%

0.13

1.03%

0.11

1.32%

0.19

OLS

Mean

2.88%

0.84

3.17%

0.77

4.82%

0.63

 

STD

0.94%

0.11

1.06%

0.13

1.81%

0.23

RLS

Mean

2.83%

0.82

3.11%

0.79

4.73%

0.69

 

STD

0.93%

0.10

1.01

0.11

1.31%

0.18

SVM

Mean

2.85%

0.82

3.00%

0.80

4.77%

0.73

 

STD

1.00%

0.09

1.04%

0.10

1.02%

0.14

ANN

Mean

2.82%

0.82

3.03%

0.81

4.74%

0.69

 

STD

0.95%

0.09

1.05%

0.12

1.17%

0.18

LWPR

Mean

3.03%

0.75

3.19%

0.78

4.97%

0.69

 

STD

1.14%

0.21

1.19%

0.13

1.31%

0.21