Estimation of Elasticity of Porous Rock Based on Mineral Composition and Microstructure

Table 2

Model summary of stepwise regression for 𝑎_𝐴.

Model	R	R square	Adjusted R square	Std. error of the estimate	Change statistics
					R square change	F change	𝑑𝑓1	𝑑𝑓2	Sig. F change
1	.542^a	.294	.274	12.53587	.294	14.560	1	35	.001
2	.713^b	.509	.480	10.60497	.215	14.906	1	34	.000
3	.834^c	.695	.668	8.47732	.186	20.208	1	33	.000

aPredictor: (constant) quartz; ^bpredictor: (constant) quartz, pressure; ^cpredictor: (constant), quartz, Pressure, and pore wall; ^ddependent variable: 𝑎_𝐴.