The Prediction of Metro Shield Construction Cost Based on a Backpropagation Neural Network Improved by Quantum Particle Swarm Optimization

Table 5

Error results of the ten-fold cross-validation.

No.	1	2	3	4	5	6	7	8	9	10
	0.9980	0.9981	0.9979	0.9975	0.9983	0.9980	0.9976	0.9976	0.9981	0.9982
(%)	1.29	1.29	1.30	1.34	1.27	1.29	1.33	1.33	1.28	1.27
	6.4363	6.6789	6.5973	6.7910	6.4672	6.4780	6.3789	6.4789	6.2671	6.6781
	6.078	6.3819	6.3891	6.4768	6.305	6.2673	6.3731	6.2781	5.7378	6.2789