## 4 Results and Discussion
### Research Questions' Findings
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Recall** & **Precision** & **MAP** & **F1 Score** & **Accuracy** & **Study** \\ \hline
0.6595 & 0.554 & 0.105 & NS & NS & [74] \\ \hline NS & NS & NS & NS & NS & [70] \\ \hline NS & NS & 0.2727 & NS & NS & [75] \\ \hline NS & NS & NS & NS & NS & [47] \\ \hline
1 & 0.952 & NS & NS & NS & [51] \\ \hline
0.2 & 0.65 & NS & NS & NS & [68] \\ \hline
0.5363 & 0.647 & 0.125 & NS & NS & [46] \\ \hline
0.611 & 0.58 & NS & NS & NS & [105] \\ \hline
0.6034 & 0.4613 & 0.1731 & NS & NS & [82] \\ \hline
0.75 & NS & NS & NS & NS & [81] \\ \hline NS & NS & NS & NS & 0.901 & [98] \\ \hline
0.651 & 0.564 & 0.296 & NS & NS & [49] \\ \hline NS & NS & NS & NS & NS & [69] \\ \hline
0.75 & 0.69 & NS & NS & NS & [60] \\ \hline NS & NS & NS & NS & NS & [92] \\ \hline
0.736 & 0.705 & NS & 0.72 & NS & [93] \\ \hline
0.7725 & 0.2426 & NS & 0.3691 & NS & [41] \\ \hline NS & NS & NS & NS & NS & [43] \\ \hline
0.579 & 0.481 & 0.105 & NS & NS & [39] \\ \hline
0.812 & 0.659 & NS & 0.726 & NS & [67] \\ \hline
0.4501 & 0.8972 & NS & 0.5995 & NS & [106] \\ \hline
0.574 & NS & NS & NS & NS & [107] \\ \hline
0.6534 & 0.549 & 0.1312 & NS & NS & [78] \\ \hline
0.954 & 0.955 & NS & 0.954 & NS & [62] \\ \hline NS & 0.891 & NS & NS & NS & [108] \\ \hline
0.944 & 0.0513 & 0.1632 & NS & NS & [76] \\ \hline
1 & 0.891 & NS & NS & NS & [50] \\ \hline
0.68 & 0.89 & NS & 0.95 & NS & [61] \\ \hline NS & NS & NS & NS & NS & [66] \\ \hline NS & NS & NS & NS & NS & [69] \\ \hline NS & NS & NS & NS & NS & [59] \\ \hline NS & 0.7354 & NS & NS & NS & [72] \\ \hline NS & 0.386 & 0.108 & NS & NS & [109] \\ \hline
0.461 & 0.486 & NS & 0.473 & NS & [110] \\ \hline NS & NS & NS & NS & NS & [111] \\ \hline NS & NS & NS & NS & NS & [112] \\ \hline NS & NS & NS & 0.639 & NS & [53] \\ \hline
0.479 & 0.398 & 0.098 & NS & NS & [73] \\ \hline
0.532 & 0.459 & 0.124 & NS & NS & [85] \\ \hline
0.564 & 0.461 & 0.126 & NS & NS & [113] \\ \hline
0.562 & NS & 0.143 & NS & NS & [84] \\ \hline NS & NS & NS & NS & NS & [114] \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Performance comparison between studies. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Recall** & **Precision** & **MAP** & **F1 Score** & **Accuracy** & **Study** \\ \hline NS & NS & NS & NS & NS & [65] \\ \hline NS & NS & NS & NS & NS & [115] \\ \hline
0.944 & 0.0513 & 0.1632 & NS & NS & [77] \\ \hline
0.83 & NS & NS & NS & NS & [71] \\ \hline NS & NS & NS & NS & NS & [40] \\ \hline
0.93 & 0.0611 & 0.214 & NS & NS & [80] \\ \hline NS & NS & NS & NS & NS & [88] \\ \hline
0.92753 & NS & NS & 0.92959 & 0.93166 & [64] \\ \hline NS & NS & NS & NS & NS & [57] \\ \hline
0.7136 & 0.65 & 0.1433 & NS & NS & [89] \\ \hline NS & NS & Na & NS & NS & [116] \\ \hline
0.364 & 0.269 & 0.106 & NS & NS & [45] \\ \hline
0.9 & 0.88 & NS & 0.89 & NS & [117] \\ \hline
0.9123 & 0.6682 & NS & 0.7714 & NS & [118] \\ \hline
0.493 & 0.506 & 0.488 & NS & NS & [58] \\ \hline
0.812 & 0.698 & 0.221 & NS & NS & [97] \\ \hline NS & NS & NS & NS & NS & [96] \\ \hline NS & NS & NS & NS & NS & [44] \\ \hline NS & NS & NS & NS & NS & [90] \\ \hline
0.83 & NS & NS & NS & NS & [99] \\ \hline NS & NS & NS & NS & NS & [94] \\ \hline NS & NS & NS & NS & NS & [87] \\ \hline NS & NS & NS & NS & NS & [91] \\ \hline NS & NS & NS & NS & NS & [91] \\ \hline NS & NS & NS & NS & NS & [42] \\ \hline NS & NS & NS & NS & NS & [55] \\ \hline
0.605 & NS & 0.529 & NS & NS & [119] \\ \hline
0.5189 & 0.5109 & 0.2585 & NS & NS & [120] \\ \hline
0.631 & 0.544 & 0.285 & NS & NS & [83] \\ \hline NS & NS & NS & NS & NS & [121] \\ \hline
0.550 & NS & 0.368 & NS & NS & [79] \\ \hline NS & NS & 0.465 & NS & NS & [95] \\ \hline NS & NS & NS & NS & 0.965 & [56] \\ \hline
0.49 & 0.99 & 0.92 & NS & NS & [54] \\ \hline NS & NS & NS & NS & NS & [86] \\ \hline NS & NS & NS & NS & NS & [63] \\ \hline NS & NS & NS & NS & NS & [48] \\ \hline NS & NS & NS & NS & 0.448 & [122] \\ \hline \hline \end{tabular} NS: Not Specified.  
\end{table} 
Table 7: _Cont._