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Table 2 Analysis of variance (ANOVA) for CCD

From: Statistical optimization of chemical modification of chitosan-magnetic nano-particles beads to promote Bacillus subtilis MK1 α-amylase immobilization and its application

Source Sum of squares Df Mean square F value P value Prob > F  
Model 1290.78 14 92.1986 27.914 < 0.0001* Significant
W: PEI % 54.4272 1 54.4272 16.4782 0.0023* Significant
X: PEI activation time 215.6272 1 215.6272 65.2825 < 0.0001* Significant
Y: GA % 413.7606 1 413.7606 125.2686 < 0.0001* Significant
Z: GA activation Time 75.645 1 75.6450 22.9020 0.0007* Significant
WX 4.9506 1 4.9506 1.4988 0.2489  
WY 80.5506 1 80.5506 24.3872 0.0006* Significant
WZ 36.9056 1 36.9056 11.1734 0.0075* Significant
XY 0.2756 1 0.2756 0.0834 0.7786  
XZ 10.7256 1 10.7256 3.2473 0.1017  
YZ 52.9256 1 52.9256 16.0236 0.0025* Significant
W2 15.7487 1 15.7487 4.7680 0.0539  
X2 139.9616 1 139.9616 42.3743 < 0.0001* Significant
Y2 14.5075 1 14.5075 4.3922 0.0625  
Z2 158.4097 1 158.4097 47.9595 < 0.0001* Significant
Error 33.0299 10 3.3030    
C. Total 1323.8096 24     
  1. R2 = 0.975, Adj R2 = 0.940, significant (P ≤ 0.05), non-significant (P > 0.05)
  2. Df degree of freedom