Monthly Attenuation Prediction for Asphalt Pavement Performance by Using GM (1, 1) Model

Table 13

Comparison of the predicted relative error of PCI and PQI in three forecast models of line 2.

Year of detection	Actual measured value of PCI of line 2	Sun Lijun model’s prediction relative error (%) [31]	Document [31] model’s prediction relative error (%) [31]	Prediction relative error of the model in this paper (%)	Actual measured value of PQI of line 2	Sun Lijun model’s prediction relative error (%) [31]	Document [31] model’s prediction relative error (%) [31]	Prediction relative error of the model in this paper (%)
2013	100				96.96
2014	97.59	0.90	1.56	0	95.32	0.44	1.07	0
2015	90.89	−1.01	−1.23	−0.016	90.88	−0.18	−0.24	0.057
2016	86.79	0.25	−0.41	0.031	86.44	−0.29	−0.82	−0.150
2017	81.41	−0.24	−0.59	−0.025	82.40	0.05	−0.32	0.117
2018	77.31	0.33	0.92	0	78.41	0.16	0.63	−0.028