Evaluation of Coalbed Methane Content by Using Kernel Extreme Learning Machine and Geophysical Logging Data

Table 3

Error results of three methods on the same testing dataset.

Method	KELM	ELM	BPNN
Average relative error (%)	15.99	18.75	21.44
RMSE (cm^3·g^-1)	2.07	2.39	2.87
	0.82	0.79	0.77