Table 4.

ANOVA table for models used in the screening of APPI parameters.

Responses	Source	Sum of squares	Degrees of freedom	Mean square	F-ratio	Prob>F	R2	Adj-R2	Pred-R2	Ade- pre
	Model	1.1×104	6	1.9×103	11	0.0001
	Residual	2.4×103	14	1.7×102
S/N(avg)	Lack of fit	2.1×103	9	2.3×102	4.0	0.0697
	Pure error	2.9×102	5	57			0.82	0.75	0.48	13.8
	Corrected total	1.6×104	21
	Model	8.3×10−1	6	1.4×10−1	16	< 0.0001
	Residual	1.0×10−1	12	8.5×10−3
Peak area(avg)	Lack of fit	9.5×10−2	7	1.4×10−2	9.9	0.0114
	Pure error	6.9×10−3	5	1.4×10−3			0.89	0.84	0.61	13.8
	Corrected total	1.0	19