Study on the Parameter Equation of Coal and Gas Outburst Hole

Table 6

Linear transformation.

Category	Variables	(x1, y1)	(x2, y2)	(x3, y3)	(x4, y4)	(x5, y5)	(x6, y6)	(x7, y7)	(x8, y8)	(x9, y9)
Raw data	x	0.75	3.93	7.64	18.68	43.56	49	60.19	72.78	379.68
	y	30.3	50	160	165	64	62.95	35	19	11.5
Transformation one	y/x	40.4	12.722646	20.942408	8.8329765	1.4692378	1.2846939	0.5814919	0.2610607	0.3028864
Transformation two	ln (y/x)	3.6988298	2.5433836	3.0417762	2.178492	0.3847438	0.2505205	−0.542158	−1.343002	−1.194397
New definition x and Y	X = x	0.75	3.93	7.64	18.68	43.56	49	60.19	72.78	379.68
	Y = ln (y/x)	3.6988298	2.5433836	3.0417762	2.178492	0.3847438	0.2505205	−0.542158	−1.343002	−1.194397