Optimization of Sunflower Oil Transesterification Process Using Sodium Methoxide

Table 3

The regression coefficients (𝑅²), adjusted 𝑅², 𝐹 ratio and 𝑃 value of the final reduced model.

Parameter	Model term	Coefficient estimate	𝐹 ratio	𝑃 value
𝛽0	Intercept	96.386	214122	0.000
Linear
𝛽1	𝑥1	−0.79	24.51	0.000
𝛽2	𝑥2	0.080	0.25	0.625^a
𝛽3	𝑥3	0.733	20.87	0.001
Quadratic
𝛽11	𝑥1∗𝑥2	—	—	0.532^a
𝛽22	𝑥2∗𝑥2	0.52	16.24	0.001
𝛽33	𝑥3∗𝑥3	—	—	0.446^a
Interaction
𝛽12	𝑥1∗𝑥2	—	—	0.175^a
𝛽13	𝑥1∗𝑥3	—	—	0.459^a
𝛽23	𝑥2∗𝑥3	—	—	0.550^a
𝑅^2	—	0.88	—	—
𝑅^2 (adj)	—	0.83	—	—
Regression (𝐹-ratio; 𝑃 value)	—	—	239.32	0.000

^aNonsignificant effect (𝑃>0.05).