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

Table 4

Model summary of stepwise regression for 𝑎_𝐶.

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	.627^a	.393	.375	15.82344	.393	22.641	1	35	.000
2	.777^b	.604	.581	12.95912	.212	18.182	1	34	.000
3	.816^c	.667	.636	12.07530	.062	6.159	1	33	.018

aPredictor: (constant), quartz; ^bpredictor: (constant), quartz, pressure; ^cpredictor: (constant), quartz, pressure, and pore among particles; ^ddependent variable: 𝑎_𝐶.