A Hybrid Model for Prediction in Asphalt Pavement Performance Based on Support Vector Machine and Grey Relation Analysis

Table 5

Precision comparison of forecast results for the three models.

Model	Correlation coefficient	RMSE	Relative error (%)
GRA-SVR	0.992	0.298	−0.081
GM (1, 1)	0.856	1.304	−0.823
GA-BP	0.984	0.448	1.270
PPI	0.879	3.270	−4.569