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Table 6 Analysis regression and variance results

From: Optimization of the culture condition of Bacillus mucilaginous using Agaricus bisporus industrial wastewater by Plackett–Burman combined with Box–Behnken response surface method

Source Sum of squares df Mean squares F value p-value prob > F Significance
Model 32,355.03 9 3595.00 249.81 < 0.0001 **
X 1 621.28 1 621.28 43.17 0.0003 **
X 2 3465.28 1 3465.28 240.79 < 0.0001 **
X 3 60.50 1 60.50 4.20 0.0795  
X 1 ·X 2 484.00 1 484.00 33.63 0.0007 **
X 1 ·X 3 663.06 1 663.06 46.07 0.0003 **
X 2 ·X 3 517.56 1 517.56 35.96 0.0005 **
X 21 13,275.04 1 13,275.04 922.45 < 0.0001 **
X 22 4020.25 1 4020.25 279.36 < 0.0001 **
X 23 6661.27 1 6661.27 462.87 < 0.0001 **
Residual 100.74 7 14.39    
Lack of fit 43.94 3 14.65 1.03 0.4683  
Pure error 56.80 4 14.20    
Cor total 32,455.76 16     
R2 = 0.9969, \({\text{R}}_{\text{Adj}}^{2}\) = 0.9929, \({\text{R}}_{\text{Pred}}^{2}\) = 0.9756  
  1. * Significant, ** very significant