Chemometric investigation of light-shade effects on essential oil yield and morphology of Moroccan Myrtus communis L.

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Table 5 Estimated regression coefficients for the model containing main, interaction and quadratic terms

Coefficients	Coefficient	Estimation	Standard error	t student	p values
Constant	b₀	1.003	0.075	13.288	<0.001***
Height	b₁	−0.004	0.001	−5.163	0.003**
Leaves length	b₂	0.131	0.096	1.367	0.230
Leaves width	b₃	−0.257	0.209	−1.229	0.274
Leaves thickness	b₄	0.000	0.000	0.118	0.911
Height*Leaves length	b₁₂	0.002	0.004	0.494	0.642
Height*Leaves width	b₁₃	−0.026	0.007	−3.710	0.013*
Height*Leaves thickness	b₁₄	0.000	0.000	2.542	0.052
Leaves length*Leaves width	b₂₃	−2.688	0.952	−2.824	0.036*
Leaves length*Leaves thickness	b₂₄	−0.003	0.002	−1.259	0.264
Leaves width*Leaves thickness	b₃₄	−0.006	0.005	−1.241	0.270
Height*Height	b₁₁	0.000	0.000	2.457	0.058
Leaves length*Leaves length	b₂₂	0.210	0.223	0.940	0.390
Leaves width*Leaves width	b₃₃	2.859	1.359	2.105	0.089
Leaves thickness*Leaves thickness	b₄₄	0.000	0.000	−0.215	0.838

*, **, ***: Significant at p < 0.05, p < 0.01 and p < 0.001 probability, respectively