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

Table 3

Model summary of stepwise regression for 𝑎_𝐵.

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	.608^a	.369	.351	13.44219	.369	20.485	1	35	.000
2	.756^b	.571	.546	11.24635	.202	16.002	1	34	.000
3	.825^c	.680	.651	9.85276	.109	11.298	1	33	.002

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