Modelling of the Elasticity Modulus for Rock Using Genetic Expression Programming

Table 2

Summary statistics for the five models of multivariable linear regression analysis.

Model number	Independent variables that contribute to model		Std. error of estimate
1		0.570	14.88615
2	, RN	0.654	13.37531
3	, RN, ρ	0.683	12.82088
4	, RN, ρ,	0.691	12.67647