## 3 Results
### Five Variables  
[PERSON] et al. [52] assessed the optimization of medium components for lipase production. Their research considered five variables: x\({}_{1}\), sucrose, x\({}_{2}\), molasses sucrose, x\({}_{3}\), yeast \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Source**} & \multirow{2}{*}{**Purpose**} & \multirow{2}{*}{\begin{tabular}{c} **Reported** \\ **Equations** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Contour and** \\ **Response** \\ **Surface Plots** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Adequate** \\ **Equations** \\ \end{tabular} } & \multirow{2}{*}{**Normality Test**} & \multirow{2}{*}{\begin{tabular}{c} **Constant** \\ **Variance Test** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Influential** \\ **Data** \\ \end{tabular} } \\ \hline \multirow{3}{*}{[PERSON] et al. [46]} & Microencapsulation & Complete & \multirow{3}{*}{curved surface} & \multirow{3}{*}{\begin{tabular}{c} y\({}_{\text{yield}}=\text{f}(\text{x}_{1},\text{x}_{2},\) \\ x\({}_{4},\text{x}_{1}\text{x}_{2})\) \\ \end{tabular} } & \multirow{3}{*}{Passed} & \multirow{3}{*}{Passed} & \multirow{3}{*}{Passed} & 4 th \\  & of peanut & equation & & & & & 17 th \\  & sprout & & & & & 30 th \\ \hline \multirow{3}{*}{[PERSON] et al. [47]} & Yield of & \multirow{3}{*}{\begin{tabular}{c} Complete \\ **resveratrol** \\ **content in** \\ **peant sprout** \\ \end{tabular} } & Complete & \multirow{3}{*}{curved surface} & \multirow{3}{*}{\begin{tabular}{c} y\({}_{\text{TAC}}=\text{f}(\text{x}_{1},\text{x}_{2},\) \\ x\({}_{3},\text{x}_{4},\text{x}_{1}\text{x}_{3})\) \\ \end{tabular} } & \multirow{3}{*}{Passed} & \multirow{3}{*}{Passed} & \multirow{3}{*}{Passed} & 18 th \\  & & peanut sprout & & & & & 19 th \\ \hline \multirow{3}{*}{\begin{tabular}{c} Javanbakht \\ **and** **Ghoresis** \\ **[48]** \\ \end{tabular} } & Lead removal & Complete & \multirow{3}{*}{curved surface} & \multirow{3}{*}{\begin{tabular}{c} y\({}_{\text{TAC}}=\text{f}(\text{x}_{1},\text{x}_{2},\) \\ x\({}_{3},\text{x}_{1}\text{x}_{4},\text{x}_{1}\text{x}_{4}\) \\ solution \\ \end{tabular} } & \multirow{3}{*}{Passed} & 7 th \\  & & & & & 23 rd \\ \hline \multirow{3}{*}{[PERSON] et al. [50]} & Natural food & \multirow{3}{*}{\
\begin{tabular}{c} Complete \\ **volorants** from \\ **wild fruits** \\ \end{tabular} } & Complete & \multirow{3}{*}{curved surface} & \multirow{3}{*}{
\begin{tabular}{c} y\({}_{\text{TAC}}=\text{f}(\text{x}_{1},\text{x}_{2},\) \\ x\({}_{3},\text{x}_{1}\text{x}_{3})\) \\ \end{tabular} } & \multirow{3}{*}{Passed} & 30 th \\  & & & & & (\(p=\) 0.011) & & 34 th \\ \hline \hline \end{tabular}
\end{table} 
Table 7: The results of the evaluation of the adequate RSM equations for the four variables. extract, x4, sunflower oil, and x5, Tuken\(-\)80. The authors proposed a complete equation, which included twenty variables for y1A, lipase activity, and yBC, biomass concentration. The contour and response surface plots were produced with two complete equations. The surface figures of the curve were presented for all variables [52]. The results of the modern regression technique are listed as follows:  
\[\text{y}_{\text{LA}}=\text{f}(\text{x}_{1},\text{x}_{2},\text{x}_{3},\text{x}_ {4},\text{x}_{5},\text{x}_{1}\text{x}_{2},\text{x}_{1}\text{x}_{3},\text{x}_ {1}\text{x}_{4},\text{x}_{1}\text{x}_{5},\text{x}_{2}\text{x}_{4},\text{x}_{3} \text{x}_{4},\text{x}_{3}\text{x}_{5},\text{x}_{4}\text{x}_{5},\text{x}_{1}{}^{ 2},\text{x}_{2}{}^{2},\text{x}_{4}{}^{2}) \tag{55}\]  
The x3\({}^{2}\) and x5\({}^{2}\) variables did not significantly affect y1. The normality and constant variance tests were passed, and there were no influential data points.