Prediction of Mine Dust Concentration Based on Grey Markov Model

Table 3

Prediction of mine dust concentration by the GM (1, 1) model.

Number	Concentration	GM (1, 1)	Relative error	Relative value	Stata
1	19.61	19.61	0	1	E2
2	15.5775	28.5716	0.834158	0.545209	E1
3	15.69	28.6092	0.823403	0.548425	E1
4	18.7425	28.647	0.528451	0.654257	E1
5	23.53	28.6847	0.219069	0.820298	E1
6	29.3186	28.7225	0.0203	1.0208	E2
7	37.2600	28.7604	0.2281	1.2955	E2
8	48.0679	28.7983	0.4009	1.6691	E3
9	58.8200	28.8362	0.5098	2.0398	E4
10	65.4248	28.8742	0.5587	2.2659	E4
…	…	…	…	…	…
37	43.1400	29.9196	0.0825	1.0899	E2
38	41.5041	29.9590	0.3065	1.4419	E3
39	35.2900	29.9985	0.2782	1.3854	E2
40	34.2565	30.0380	0.1499	1.1764	E2
41	35.2900	30.0776	0.1231	1.1404	E2
42	33.7009	30.1173	0.106335	1.118988	E2
43	31.37	30.157	0.038668	1.040223	E2
44	30.9197	30.1967	0.023383	1.023943	E2
45	31.37	30.2365	0.036133	1.037488	E2
46	30.8403	30.2764	0.018285	1.018625	E2
47	27.45	30.3163	0.104419	0.905454	E1