Study on the Modification Formula of Earth Material Compound with Cement and Gravel by Single Lattice Theory

Table 8

Estimation of the partial regression coefficient of y₁ regression equation for compressive strength of mixed cement and gravel modified with raw soil.

Regression term	Partial regression estimation	t-test		Regression error of partial regression estimation
x1	12.23	21.34	0.0001	0.573
x2	4.13	7.22	0.0001	0.571
x3	5.92	10.32	0.0001	0.571

Combining regression equation y₁, solving the equation  = 11.51,  = 3.75，range  = 7.76,  = 7.43, gradient  = 1, using Mathcad software, the results of equation y₁ are shown in Table 9.