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

Table 2

Relevance of each influencing factor.

Influencing factor
γ	0.9301	0.6794	1.0397	0.9698	0.8539	0.9241	0.7685	0.7999	0.7052	0.7998	0.8806	0.7866	0.8409	0.8326	0.9049	0.8472	0.8077	0.7593	0.8622

is pavement structure strength ratio; is the service life; is the equivalent single axle loads; is the maintenance funds; is the average annual rainfall; is the mean value of soil moisture; is the mean value of environment humidity; is the annual maximum wind speed; is the highest temperature of environment; is the lowest temperature of the environment; is the highest temperature of road surface; is the lowest temperature of road surface; is the highest temperature of upper surface; is the lowest temperature of upper surface; is the highest temperature in middle surface; is the lowest temperature in middle surface; is the highest temperature in lower surface; is the lowest temperature in lower surface; is the annual cumulative total radiation.