Optimization of Polygalacturonase Production from a Newly Isolated Thalassospira frigidphilosprofundus to Use in Pectin Hydrolysis: Statistical Approach

Table 7

Analysis of variance for quadratic model.

Source	df	Seq SS	Adj SS	MS	F value	Prob. (P) > F
Regression	14	159.379	159.3789	11.3842	16.45	0.000
Linear	4	53.139	53.1393	13.2848	19.20	0.000
Square	4	86.477	86.4770	21.6193	31.25	0.000
Interaction	6	19.763	19.7626	3.2938	4.76	0.007
Residual error	15	10.378	10.3782	0.6919
Lack of fit	10	9.465	9.4649	0.9465	5.18	0.042
Pure error	5	0.913	0.9133	0.1827
Total	29	169.757

S = 0.8318, R-Sq = 93.90%, and R-Sq (adj) = 88.20%.
SS: sum of squares, MS: mean of squares, and df: degree of freedom.