Table 4.

Estimated effects and coefficients for R% (coded units).

Term	Effect	Coefficient	SE	t-test	P value	Remark
Constant		80.1125	0.1971	406.48	0.000	Significant
A	17.7000	8.8500	0.1971	44.90	0.000	Significant
B	10.7250	5.3625	0.1971	27.21	0.000	Significant
C	3.0000	1.5000	0.1971	7.61	0.001	Significant
D	8.7750	4.3875	0.1971	22.26	0.000	Significant
A∗B	0.1500	0.0750	0.1971	0.38	0.719
A∗C	−0.3750	−0.1875	0.1971	−0.95	0.385
A∗D	−0.2500	−0.1250	0.1971	−0.63	0.554
B∗C	−0.5000	−0.2500	0.1971	−1.27	0.260
B∗D	1.0250	0.5125	0.1971	2.60	0.048	Significant

SE: standard errors, standard deviation = 0.78, PRESS = 31.82, R ² = 99.85%,R ² (predicted) = 98.46%, and R ² (adjusted) = 99.55%.