Table 2. Fit summary model for particle size.

Sequential Model Sum of Squares for Particle size
Source	Sum of Squares	df	Mean Square	F Value	p-value (Prob> F)	Action
Mean vs Total	3.757E+005	1	3.757E+005
Linear vs Mean	13239.75	3	4413.25	4.22	0.0326
2FI vs Linear	4558.50	3	1519.50	1.75	0.2345
Quadratic vs 2FI	6131.43	3	2043.81	12.41	0.0094	Suggested
Cubic vs Quadratic	287.25	3	95.75	0.36	0.7939	Aliased
Residual	536.00	2	268.00
Total	4.005E+005	15	26698.53
Model Summary Statistics for particle size
Source	Std. Dev.	R-Squared	Adjusted R-Squared	Predicted R-Squared	PRESS	Action
Linear	32.35	0.5349	0.4080	0.0276	24069.58
2FI	29.48	0.7190	0.5083	-0.3966	34569.50
Quadratic	12.83	0.9667	0.9069	0.7656	5802.00	Suggested