Research on SVR Water Quality Prediction Model Based on Improved Sparrow Search Algorithm

Table 7

Average grey relational grade at each factor and level.

Factor	Level 1	Level 2	Level 3	Max-min	Rank
A	0.538	0.482	0.607	0.125	3
B	0.683	0.486	0.457	0.226	1
C	0.478	0.628	0.466	0.162	2

The bold values demonstrate the optimal response value and the highest S/N for each optimisation objective.