Table 2. Fit summary of individual parameters (quadratic model) for quality prediction of peanut hull

Source	Sequential p-value	F-value	Lack of fit p-value	Adjusted R2	Predicted R2
Luteolin	<0.0001	1.53	0.2717	0.9625	0.9509
Total phenolic content1)	<0.0001	2.36	0.1399	0.9941	0.9883
Total flavonoid content	0.0355	1.09	0.4016	0.7987	0.5640
ABTS scavenging activity %	0.0005	1.16	0.3766	0.9693	0.9341
DPPH scavenging activity %	<0.0001	1.49	0.2819	0.9800	0.9582

Total phenolics content was analyzed under ‘Inverse transform’ conditions due to wide range. p-value≤α: The lack-of-fit is statistically significant.