Optimization of GC-MS Method for Analysis of Basil Essential Oils from Algeria: Design of Experiments and Exploratory Pattern Recognition

Table 4

Effect estimates from first factorial design (n = 8).

		A coefficient	Std. err.	t value	value
Number of peaks (r^2 = 98.37% Adj. r^2 = 94.57% S = 5.994)	Mean/Interact.	113.88	2.12	53.73	≤0.001
	X1	15.63	2.12	7.37	0.005
	X2	15.87	2.12	7.49	0.005
	X3	16.38	2.12	7.73	0.871
	X1 X2	−0.37	2.12	−0.18	0.237
	X1 X2	3.12	2.12	1.47	0.441
	X2 X3	1.87	2.12	0.88	0.001
Experimental resolution (r^2 = 98.18% Adj. r^2 = 93.93% S = 0.0693)	Mean/Interact.	0.3710	0.0245	15.14	0.001
	X1	−0.2870	0.0245	−11.71	0.097
	X2	0.0585	0.0245	2.39	0.050
	X3	−0.0780	0.0245	−3.18	0.375
	X1 X 2	0.0255	0.0245	1.04	0.822
	X1 X2	−0.0060	0.0245	−0.24	0.131
	X2 X3	−0.0505	0.0245	−2.06	0.005

X ₁: slope; X₂: gas flow rate; X₃: split ratio.