Table 6 Variance analysis of water activity of response surface

Variation source	Sum of squares	Freedom	Mean square deviation	F-value	p-value	Significance
Model	5.24E-03	9	5.82E-04	12.51	0.0015	**
A	4.21E-04	1	4.21E-04	9.04	0.0197	*
B	3.25E-04	1	3.25E-04	6.99	0.0332	*
C	5.51E-05	1	5.51E-05	1.19	0.3123
AB	1.23E-05	1	1.23E-05	0.26	0.6235
AC	7.23E-05	1	7.23E-05	1.55	0.2526
BC	2.56E-04	1	2.56E-04	5.51	0.0413	*
A2	1.07E-03	1	1.07E-03	23.04	0.002	**
B2	2.47E-03	1	2.47E-03	53.04	0.0002	**
C2	2.18E-04	1	2.18E-04	4.69	0.0669
Residual	3.26E-04	7	4.65E-05
Missing item	1.10E-04	3	3.68E-05	0.68	0.6073
Pure error	2.15E-04	4	5.38E-05
All items	5.56E-03	16
r2	0.9415
Adj r2	0.9209

^* p<0.05
^** p<0.01.