Table 2.

Experimental domain and RMSEp for the two-level full factorial design employed during ANN factor screening process.

Hidden units (X1)	Iteration cycles (X2)	Spectra region [1/cm] (X3)	Transformation (X4)	RMSEp
				Crystalline	Amorphous
2	1000	800–1800	Untreated	1.22 ± 0.29	2.14 ± 0.57
2	5000	800–1800	Untreated	1.03 ± 0.01	2.81 ± 0.06
2	1000	2800–3500	Untreated	6.03 ± 0.45	3.32 ± 0.18
2	5000	2800–3500	Untreated	6.00 ± 0.02	3.74 ± 0.01
2	1000	800–1800	2nd derivative	0.98 ± 0.04	2.80 ± 0.03
2	5000	800–1800	2nd derivative	1.03 ± 0.01	2.74 ± 0.06
2	1000	2800–3500	2nd derivative	7.09 ± 0.71	5.38 ± 0.28
2	5000	2800–3500	2nd derivative	7.50 ± 0.10	5.44 ± 0.10
5	3000	800–1800	Untreated	6.74 ± 1.45	12.91 ± 1.52
5	3000	2800–3500	Untreated	5.63 ± 0.93	3.58 ± 0.27
5	3000	800–1800	2nd derivative	0.86 ± 0.15	2.69 ± 0.07
5	3000	2800–3500	2nd derivative	6.61 ± 0.87	6.94 ± 2.13
8	1000	800–1800	Untreated	3.00 ± 0.61	3.86 ± 0.07
8	5000	800–1800	Untreated	6.38 ± 0.14	11.41 ± 0.09
8	1000	2800–3500	Untreated	6.64 ± 0.73	3.93 ± 0.26
8	5000	2800–3500	Untreated	6.28 ± 1.72	4.05 ± 0.48
8	1000	800–1800	2nd derivative	1.01 ± 0.06	2.80 ± 0.02
8	5000	800–1800	2nd derivative	2.19 ± 0.72	4.28 ± 1.00
8	1000	2800–3500	2nd derivative	7.00 ± 0.68	4.51 ± 0.99
8	5000	2800–3500	2nd derivative	6.11 ± 0.72	6.83 ± 0.50