[Retracted] Prediction of Concrete Compressive Strength Based on the BP Neural Network Optimized by Random Forest and ISSA

Table 5

Statistical features of concrete data sets.

Concrete components	Maximum	Minimum	Mean	Std deviation
Cement	540.0	102.0	281.2	104.50
Blast furnace slag	359.4	0.0	73.9	86.27
Fly ash	200.1	0.0	54.2	63.99
Water	247.0	121.8	181.6	21.35
Superplasticizer	32.2	0.0	6.2	5.97
Coarse aggregate	1145.0	801.0	972.9	77.75
Fine aggregate	992.6	594.0	773.6	80.17
Age	365.0	1.0	45.7	63.16
Concrete compressive strength	82.6	2.3	35.8	16.70