Optimized Liquid-Liquid Extractive Rerefining of Spent Lubricants

Table 4

Analyses of variance and goodness of fit for the multivariate process models for sludge yields.

	Model for ln(𝑌𝐴) (7)			Model for ln(𝑌𝐾) (8)
	DF	SS	MSS	DF	SS	MSS
Regression	8	0.9087	0.1136	7	1.4429	0.2061
Residual	13	0.0937	0.0072	14	0.1476	0.0105
Replicate	6	0.0343	0.0057	6	0.0503	0.0084
Total	21	1.0024	0.0477	21	1.5906	0.0757
Lack-of-fit	7	0.0594	0.0085	8	0.0973	0.0122
	𝐹 ratio		𝑃 value	𝐹 ratio		𝑃 value
MLR	15.7563		1.6002𝐸−5	19.5478		3.2498𝐸−6
Lack-of-fit	1.4815		0.3240	1.4506		0.3345
𝑅^2	0.9065			0.9072
𝑅^2Adjusted	0.8490			0.8608