Table 7 Results from the application of raw and minimum–maximum preprocessing for 7-day compressive strength by using DAVO algorithm.

7-day compressive strength	Neuron number	30	60	90	120	150	180	210	240	270	300
MSE test	Raw	58.58	51.09	30.78	31.70	29.62	45.46	77.64	49.32	40.97	47.30
MSE test	Min–Max	58.58	51.09	32.91	31.70	29	27.52	77.64	49.32	40.97	47.30
MSE train	Raw	43.51	41.32	27.09	31.56	32.96	35.92	62.16	42.04	36.94	47.82
MSE train	Min–Max	43.51	41.32	27.79	31.56	31.03	26.29	62.16	42.04	36.94	47.82
R test	Raw	0.78	0.81	0.89	0.89	0.89	0.84	0.7	0.82	0.85	0.83
R test	Min–Max	0.78	0.81	0.88	0.89	0.89	0.90	0.7	0.82	0.85	0.83
R train	Raw	0.83	0.84	0.90	0.89	0.87	0.86	0.76	0.84	0.86	0.81
R train	Min–Max	0.83	0.84	0.89	0.89	0.88	0.90	0.76	0.84	0.86	0.81

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