Modelling of the Elasticity Modulus for Rock Using Genetic Expression Programming

Table 6

Statistical parameters for predicting .

	GEP model		Best MRA model	Best URA model
	Training	Validation
	0.90	0.91	0.68	0.72	0.43
RMSE	7.02	6.66	12.27	46.10	26.53
MAPE	5.44	4.97	87.96	98.49	102.56