Biological Pretreatment by Solid-State Fermentation of Oat Straw to Enhance Physical Quality of Pellets

Table 4

Coefficient values of the fitting model for different responses of oat straw pellets pretreated with PC.

Response variable	Source		Sum of squares	Mean squares	value	value
Density 0	Model	14	14983.37	1070.24	26.34	<0.0001
		1	6960.08	6960.08	171.31	<0.0001
		1	805.24	805.24	19.82	0.0005
		1	1673.24	1673.24	41.18	<0.0001
		1	643.89	643.89	15.85	0.0014
		1	327.43	327.43	8.06	0.0131
		1	2616.91	2616.91	64.41	<0.0001
		1	764.54	764.54	18.82	0.0007
	Lack of fit	10	435.63	43.56	1.31	0.4280
Density 1	Model	14	13279.73	948.55	8.15	0.0002
		1	7333.44	7333.44	63.02	<0.0001
		1	3107.30	3107.30	26.70	0.0001
		1	1219.17	1219.17	10.48	0.0060
	Lack of fit	10	923.37	92.34	0.52	0.8148
Dimensional stability	Model	14	25.06	1.79	2.65	0.0396
		1	3.78	3.78	5.59	0.0330
		1	5.79	5.79	8.57	0.0110
	Lack of fit	10	2.54	0.25	0.15	0.9936
Tensile strength	Model	14	0.024	0.002	5.79	0.0011
		1	0.008	0.008	28.66	0.0001
		1	0.003	0.003	10.58	0.0058
		1	0.004	0.004	14.40	0.0020
		1	0.003	0.003	10.97	0.0051
	Lack of fit	10	0.002	0.0002	0.43	0.8744