Optimization of Working Conditions for Perovskite-Based Gas Sensor Devices by Multiregression Analysis

Table 2

Full-factorial design with two factors and three levels for the resolution ability index, RAI. Model matrix column shows the surrogate variables, which are X₁ and X₂; experimental matrix column shows the real variables, which are oven temperature and inlet-gas flow rate; response column shows the values of resolution ability index.

	Model matrix		Experimental matrix		Response
	X1	X2	T (°C)	φ (cm^3/min)	RAI (d.u.)
ex1	−1	1	300	100	2.2 ± 0.7
ex2	1	1	460	100	82.5 ± 0.7
ex3	−1	−1	300	40	1.9 ± 0.7
ex4	1	−1	460	40	74.8 ± 0.7
ex5	−1	0	300	70	1.1 ± 0.7
ex6	1	0	460	70	124.2 ± 0.7
ex7	0	−1	380	40	211.1 ± 0.7
ex8	0	1	380	100	126.2 ± 0.7
ex9	0	0	380	70	235.7 ± 0.7