Prediction of Residual Gas Content during Coal Roadway Tunneling Based on Drilling Cuttings Indices and BA-ELM Algorithm

Table 2

Standardized collected parameters.

No.	K1	S	Q
1	0.857	−0.556	0.778
2	−0.357	−0.778	−0.028
3	−0.143	−0.778	0.089
4	−0.071	−0.778	0.122
5	−0.857	−0.556	−0.552
6	−0.929	−0.556	−0.944
7	−1.000	−1.000	−1.000
8	0.071	−0.778	0.236
9	−0.214	−0.778	0.064
10	0.071	−0.111	0.278
11	−0.500	−0.333	0.259
12	0.929	−0.333	0.693
13	−0.286	−0.778	0.106
14	0.500	−0.333	0.357
15	−0.929	−0.778	−0.231
16	−0.643	−1.000	−0.410
17	−0.714	−0.333	0.085
18	0.214	−0.333	0.616
19	0.571	1.000	1.000
20	1.000	−0.111	0.804