Prediction of Residual Gas Content during Coal Roadway Tunneling Based on Drilling Cuttings Indices and BA-ELM Algorithm

Table 4

Errors and determination coefficients of different prediction methods.

Model type	Average absolute error	Average absolute percentage error	Determination coefficient
BP	0.164	0.029	0.890
SVM	0.139	0.025	0.909
ELM	0.120	0.020	0.940
BA-ELM	0.069	0.012	0.981