Table 3.

Definitive screening design matrix and response for biodiesel yield.

Run	Experimental parameters of Transesterification					Biodiesel Yield		Error
	(R-T)1	(C-C)2	(E-O-R)3	(R-T)4	(A-R)5	(A-Y)6	(P-Y)7	Resid.	Std-Resd.
1	65	5	20	77	1000	92	91.91	-0.005	-0.04
2	65	2.75	15	61	875	92	92.03	0.174	1.27
3	65	0.5	10	45	750	92.4	92.15	0.025	0.23
4	80	0.5	15	77	1000	90.8	91.08	0.002	0.01
5	80	5	10	77	750	94.2	94.24	-0.230	-1.77
6	80	5	10	45	875	93.0	93.41	0.090	0.69
7	50	0.5	20	45	1000	89.66	89.64	-0.015	-0.14
8	50	5	15	45	750	92.8	92.97	-0.038	-0.30
9	50	0.5	20	77	875	89.2	89.23	-0.167	-1.28
10	80	0.5	20	45	750	90	90.09	-0.005	-0.04
11	65	2.75	15	61	875	92	92.03	-0.120	-1.11
12	50	5	20	61	750	91.8	91.63	0.131	1.20
13	80	0.5	10	61	1000	92.7	92.42	-0.296	-2.27
14	50	0.5	10	77	750	91.3	91.52	0.120	0.88
15	50	2.75	10	45	1000	93.2	93.15	0.027	0.21
16	80	5	20	45	1000	92.5	92.54	0.099	0.76
17	50	5	10	77	1000	94.	93.97	0.052	0.38
18	80	2.75	20	77	750	91.04	90.91	0.157	1.15

Resid; Residual, Std-Resd; Standard residual.

¹Reaction time (min)

²Catalyst concentration (w/w %)

³Ethanol to oil ratio (g/g)

⁴Reaction temperature (0C)

⁵Agitation rate (rpm)

⁶Actual yield (%)

⁷Predicted yield (%)