Research on Deformation Prediction of Foundation Pit Based on PSO-GM-BP Model

Table 15

Comparison of relative error of three models.

Period	Relative error (%)
	PSO-GM (1, 1)	PSO-BP	PSO-GM-BP
13	−2.18	0.11	−0.20
14	−1.98	0.96	0.10
15	−2.30	0.82	−0.20
Average relative error	2.15	0.63	0.17