Bioresources and Bioprocessing

Table 4 The analysis of variance

From: Optimization of Clostridium beijerinckii semi-solid fermentation of rape straw to produce butyric acid by genome analysis

Model	Sum of squares	Degree of freedom	Mean square	F	Significance
Modified model	17.557^a	12	1.463	19.266	0.016*
Intercept	2391.944	1	2391.944	31497.981	0.000**
A	14.450	3	4.817	69.430	0.003**
B	0.608	3	0.203	2.669	0.221
C	2.292	3	0.764	10.060	0.045*
D	0.206	3	0.069	0.905	0.532
Error	0.228	3	0.076
Total	2409.728	16
Corrected total	17.784	15

*significant (p < 0.05 ); **very significant (p < 0.01)
^aR square = 0.987 (adjusted a. R square = 0.936)

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