Table 1.

Best mathematical model for each response and its evaluation parameters: coefficients of determinations (R²_adj and R²_pred). Mallows’ Cp statistic and ANOVA results (p-values of regression and lack of fit).

Response	Best Model a	${\mathit{R}}^2$	${\mathit{R}}_{\mathit{a}\mathit{d}\mathit{j}}^2$	${\mathit{R}}_{\mathit{p}\mathit{r}\mathit{e}\mathit{d}}^2$	Mallow’s Cp	p-Value Regr b	p-Value Lof b
Yield (%)	Y = 5.92 − 7.15MP + 0.011ET + 3.49MP2	0.940	0.914	0.813	2.83	***	ns
Thymol (g/100 g)	Y = 126.3 − 99.7MP − 0.063ET + 46.3MP2	0.914	0.878	0.807	2.43	***	ns
γ-Terpinene (g/100 g)	Y = −16.1 + 54.7MP − 0.058ET − 28.55MP2 + 0.075MP * ET	0.880	0.799	0.675	4.09	**	ns
p-Cymene (g/100 g)	Y = −25.19 + 55.3MP + 0.125ET − 25.12MP2 − 0.0004ET2	0.965	0.942	0.862	4.39	***	ns
Carvacrol (g/100 g)	Y = −0.143 + 0.536MP + 0.004ET − 0.004MP * ET	0.387	0.125	<0.001	2.14	ns	ns

^a The models are reported using the coefficients calculated from the uncoded variables. ^b The results of p-value columns are reported as follows: ns = p > 0.05; * 0.05 < p < 0.01; ** 0.01 < p < 0.001; *** p < 0.001.