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Table 2 Statistical analysis of the Box-Behnken design

From: Indole-3-acetic acid production by Streptomyces fradiae NKZ-259 and its formulation to enhance plant growth

Source Sum of squares Degree of freedom Mean square F-value p-value (prob >F)
Model 14,220.13 14 1015.72 9.26 < 0.0001
A-Starch 781.77 1 781.77 7.13 0.0110
B-KNO3 842.58 1 842.58 7.69 0.0085
C-NaCl 542.72 1 542.72 4.95 0.0319
D-K2HPO4 276.29 1 276.29 2.52 0.1205
E-Tryptophan 108.14 1 108.14 0.99 0.3268
F-Incubation time 1320.17 1 1320.17 12.04 0.0013
AC 435.48 1 435.48 3.97 0.0533
AE 349.03 1 349.03 3.18 0.0822
DF 936.62 1 936.62 8.54 0.0057
A2 1836.64 1 1836.64 16.75 0.0002
B2 2273.38 1 2273.38 20.74 < 0.0001
C2 1569.56 1 1569.56 14.32 0.0005
E2 3062.90 1 3062.90 27.94 < 0.0001
F2 789.01 1 789.01 7.20 0.0107
Residual 4275.65 39 109.63   
Lack of Fit 3898.03 34 114.65 1.52 0.3430
Pure Error 377.63 5 75.53   
  1. R2 = 0.7688; Adj R2 = 0.6858; Pred R-squared = 0.5471