Predicting the Viscosity of Petroleum Emulsions Using Gene Expression Programming (GEP) and Response Surface Methodology (RSM)

Table 3

Analysis of variance (ANOVA) for emulsion viscosity.

Source	Sum of squares	Df	Mean square	-ratio	-value
A:time (days)	35219.0	1	35219.0	463.92	0.0000
B:oil viscosity (cP)	1678.34	1	1678.34	22.11	0.0000
C:water viscosity (cP)	1.72024	1	1.72024	0.02	0.8805
D:water cut (v/v%)	16900.1	1	16900.1	222.62	0.0000
E:amount of solids (wt%)	22750.1	1	22750.1	299.68	0.0000
AA	63.0	1	63.0	0.83	0.3636
AB	146.72	1	146.72	1.93	0.1663
AC	1.72024	1	1.72024	0.02	0.8805
AD	750.149	1	750.149	9.88	0.0020
AE	132.149	1	132.149	1.74	0.1888
BB	336.667	1	336.667	4.43	0.0367
BC	70.7232	1	70.7232	0.93	0.3358
BD	1674.01	1	1674.01	22.05	0.0000
BE	19.7232	1	19.7232	0.26	0.6109
CC	17.04	1	17.04	0.22	0.6363
CD	3118.58	1	3118.58	41.08	0.0000
CE	808.938	1	808.938	10.66	0.0013
DD	769.056	1	769.056	10.13	0.0017
DE	2100.22	1	2100.22	27.67	0.0000
EE	139.286	1	139.286	1.83	0.1774
Total error	12753.8	168	75.9156
Total (corr.)	99359.9	188