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

Table 9

Comparison of relative error of three models.

Period	Relative error (%)
	PSO-GM (1, 1)	PSO-BP	PSO-GM-BP
13	−1.69	1.95	1.45
14	−5.73	−2	−0.60
15	−5.06	2.01	1.94
Average relative error	4.16	1.98	1.33