Table 2.

Analysis of variance (ANOVA) for fitted model of protein yield and pectin yield

Source	Protein yield		Pectin yield
	Sum of squares	p value	Sum of squares	p value
Model	1433.31	0.0110	2453.96	0.0012
$x_T$	794.42	0.0006	1348.30	< 0.0001
$x_t$	108.57	0.1001	239.29	0.0109
$x_{\mathit{pH}}$	41.17	0.2906	299.21	0.0064
$x_T{x}_t$	75.15	0.1626	116.07	0.0481
$x_T{x}_{\mathit{pH}}$	16.19	0.5001	23.77	0.3152
$x_t{x}_{\mathit{pH}}$	23.19	0.4220	25.13	0.3027
$x_T^2$	283.19	0.0151	247.96	0.0101
$x_t^2$	130.26	0.0753	97.81	0.0642
$x_{\mathit{pH}}^2$	6.50	0.6669	77.10	0.0924
Residual	330.73		142.15	–
Lack of fit	255.71	0.1023	56.71	0.5208
R2	0.81		0.94
Adj R2	0.64		0.87
Pred R2	− 0.39		0.59
Adeq precision	7.86		14.43
C.V.%	10.06		9.92