Experimental Study on Mudstone’s Strength Characteristics in Deep-Buried Coal-Measure Formation: A Case Study of Permian Longtan Formation

Table 4

UCS and I_s(50) fitting parameters.

Item	Fitting type	Weight	Residual sum of squares	Pearson’s r	COD(R^2)	Adjusted R^2
Value	Linear	No weighting	70.728	0.943	0.890	0.863
	Logarithmic	—	10.416	—	0.935	0.919