Prediction of California Bearing Ratio of Granular Soil by Multivariate Regression and Gene Expression Programming

Table 8

GEP parameters obtained for the best three models.

Chromosomes	30
Error type fitness function	RMSE and R^2
Count of the genes	5
Head size	10
Linking function	+
Function set	+, -, ×, /, √
Mutation rate	0.044
One-point recombination rate	0.3
The recombination rate of two points	0.3
Inversion rate and transposition rate	0.1