Research on the Grey Verhulst Model Based on Particle Swarm Optimization and Markov Chain to Predict the Settlement of High Fill Subgrade in Xiangli Expressway

Table 1

Appraise criteria of MAPE based on Lewis [unit: %].

MAPE	<10	10-20	20-50	>50
Predictive ability	Excellent	Good	Reasonable	Inaccurate