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

Table 6

Performance comparison of four models.

Model	Operability	Prediction period	Accuracy	Consideration of factors
GRA-SVR	★	★★★	★★★	★★★
PPI	★★★	★	★	★★
GM (1, 1)	★★	★★	★★	★
GA-BP	★	★★	★	★★★

★ means performance in general, ★★ means better performance, and ★★★ means the best performance.