Plackett–Burman Combined with Box–Behnken to Optimize the Medium of Fermented Tremella Polysaccharide and Compare the Characteristics before and after Optimization

Table 5

Variance analysis results of the Plackett–Burman experiment.

Source	Sum of squares	df	Mean square	F value	value prob > F
Model	151.6	3	50.53	61.19	<0.0001	Significant
A- potato extract	87.62	1	87.62	106.1	<0.0001
B- glucose	42.94	1	42.94	52	<0.0001
F- peptone	21.04	1	21.04	25.47	0.0005
Curvature	9.68 × 10^−3	1	9.68 × 10^−3	0.012	0.9159	Not significant
Residual	8.26	10	0.83
Lack of fit	7.43	8	0.93	2.25	0.3437	Not significant
Pure error	0.83	2	0.41
Cor total	159.86	14