Table 3 Analysis of variance (ANOVA) for response surface quadratic model [Partial sum of squares - Type III]
Source | Sum of squares | df | Mean square | F value | p-value prob. > F | |
|---|---|---|---|---|---|---|
Model | 6574.93 | 9 | 730.55 | 1233.66 | < 0.0001 | significant |
A - Catalyst loading | 1.74 | 1 | 1.74 | 2.94 | 0.1174 | |
B - pH | 1018.93 | 1 | 1018.93 | 1720.64 | < 0.0001 | |
C - Time | 64.92 | 1 | 64.92 | 109.63 | < 0.0001 | |
AB | 3.01 | 1 | 3.01 | 5.09 | 0.0477 | |
AC | 0.95 | 1 | 0.95 | 1.60 | 0.2351 | |
BC | 0.18 | 1 | 0.18 | 0.31 | 0.5905 | |
A2 | 320.08 | 1 | 320.30 | 540.87 | < 0.0001 | |
B2 | 1626.01 | 1 | 1626.01 | 2745.80 | < 0.0001 | |
C2 | 7.02 | 1 | 7.92 | 13.38 | 0.0044 | |
Residual | 5.92 | 10 | 0.59 | |||
Lack of fit | 2.54 | 5 | 0.51 | 0.75 | 0.6201 | Not significant |
Pure error | 3.38 | 5 | 0.68 | |||
Cor total | 6580.86 | 19 |