Table 7.

Regression analysis summary for different models fitting data.

Source	Sequential p-Value	Lack of Fit p-Value	Adjusted R2	Predicted R2
Response Y1
Linear	0.0047	0.1296	0.5906	0.3406
2FI	0.0989	0.1796	0.7322	0.3093
Quadratic	0.0143	0.5966	0.9397	0.7900	Suggested
Response Y2
Linear	<0.0001	0.3068	0.8832	0.8365
2FI	0.4096	0.2950	0.8858	0.7915
Quadratic	0.0373	0.6750	0.9619	0.8810	Suggested