Table 12 Results of the effect of different transfer functions between 2 layers in predicting compressive strength of 7 and 28 days of self-compacting concrete.

	Transfer functions	Tansig–Tansig	Tansig–logsig	Tansig- purline	Purline–logsig	Purline–purline	Purline–Tansig	logsig–logsig	logsig–purline	logsig–tansig
MSE Test	\({F}_{c}7\)	51.21	153.01	56..10	208.87	59.66	59.24	144.40	45.95	51.35
MSE Test	\({F}_{c}28\)	66.34	371.56	105.57	295.56	208.87	208.36	371.56	62.91	76.98
MSE Train	\({F}_{c}7\)	35.75	128.96	55.60	172.58	87.49	95.51	123.49	63.76	71.81
MSE Train	\({F}_{c}28\)	47..89	339.25	105.89	290.90	218.45	222.38	339.25	59.38	56.99
R Test	\({F}_{c}7\)	0.84	0.67	0.83	−0.16	0.87	0.83	0.75	0.87	0.86
R Test	\({F}_{c}28\)	0.90	−0.25	0.84	0.58	0.65	0.64	−0.17	0.90	0.88
R Train	\({F}_{c}7\)	0.86	0.60	0.77	−0.12	0.61	0.56	0.70	0.73	0.69
R Train	\({F}_{c}28\)	0.92	−0.13	0.82	0.47	0.57	0.57	−0.12	0.90	0.90

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