Auto-regressive 2 Backpropagation 2 Complex nonlinear system 2 Joints (anatomy) 2 Mean square error 2 Muscle 2 Muscle modeling 2 Neural network model 2 Neural networks 2 Non-linear model 2 Nonlinear systems 2 artificial neural network 2 backpropagation 2 nonlinear autoregressive quadriceps muscle 2 Back propagation neural networks 1 Backpropagation algorithms 1 Deep neural networks 1 E-learning 1 Information set 1 Logical modeling 1 Neural systems 1 Non-linear relationships 1 Planning data 1 Statistical tests 1