Table 1.

Variance analysis (95% confidence level).

Method	Source of variation	Sum of squares	Degrees of freedom	Mean squares	F	F tab
ESL	Regression	0.6786	5	0.1357	8.95	5.05
	Residual	0.0758	5	0.0152
	Total	0.7544	10	0.0754
	Pure error	0.0294	2	0.0147	1.05	19.16
	Lack of fit	0.0464	3	0.0155
	R2	0.8995
UAE	Regression	0.6298	5	0.1260	30.42	5.05
	Residual	0.0207	5	0.0041
	Total	0.6505	10	0.0651
	Pure error	0.0087	2	0.0044	0.91	19.16
	Lack of fit	0.0120	3	0.0040
	R2	0.9682