Prediction of Concrete Compressive Strength by Evolutionary Artificial Neural Networks

Table 5

Coefficients of MLR model.

		SE coef.	Coef.	Predictor		Number
−600	108	−5.55	0	Constant	Constant parameter	1
0.1685	0.1601	1.05	0.295		Water-cement ratio	2
0.1762	0.3456	0.51	0.611		Maximum size of sand	3
0.20611	0.05862	3.52	0.001		Gravel	4
1.01053	0.06292	16.06	0		Cement	5
0.4264	0.2541	1.68	0.096		Sand 3/8	6
0.2452	0.1705	1.44	0.153		Sand 3/4	7
−0.529	1.756	−0.3	0.764		Coefficient of soft sand	8