Application of Extreme Gradient Boosting Based on Grey Relation Analysis for Prediction of Compressive Strength of Concrete

Table 4

The characteristics of dataset (600 groups of data selected from 18 research articles).

Factors	Minimum values	Maximum values	Average	Standard deviation
W/B	0.18	0.60	0.35	0.10
Sand ratio (%)	0.33	1	0.45	0.09
Cement type (four types)	1	4	—	—
Slag content (%)	0	20	0.83	0.83
MK content (%)	0	20	9.01	6.90
Dosage of water-reducing agent (%)	0	3.5	0.83	0.84
Curing age (days)	1	180	37.37	43.48
Compressive strength (MPa)	8.93	130.85	68.55	22.68