Table 9.
Friedman ranking test for the methods of SSIM for the COVID-19 experiment
| SSIM_rank | K | AO | WOA | SSA | RSA-SSA | RSA | MPA | PSO |
|---|---|---|---|---|---|---|---|---|
| COVID1 | 2 | 4 | 5 | 6 | 1 | 3 | 7 | 2 |
| 3 | 2 | 4 | 1 | 3 | 5 | 6 | 7 | |
| 4 | 6 | 7 | 1 | 4 | 3 | 5 | 2 | |
| 5 | 5 | 7 | 4 | 1 | 6 | 2 | 3 | |
| 6 | 7 | 2 | 6 | 4 | 5 | 3 | 1 | |
| SUM | 22 | 20 | 18 | 13 | 22 | 19 | 13 | |
| Mean rank | 4.4 | 4 | 3.6 | 2.6 | 4.4 | 3.8 | 2.6 | |
| Final rank | 5 | 4 | 2 | 1 | 5 | 3 | 1 | |
| COVID2 | 2 | 1 | 5 | 4 | 3 | 6 | 7 | 2 |
| 3 | 3 | 7 | 2 | 1 | 4 | 5 | 6 | |
| 4 | 4 | 2 | 5 | 1 | 6 | 3 | 7 | |
| 5 | 7 | 1 | 5 | 4 | 2 | 3 | 6 | |
| 6 | 4 | 3 | 7 | 1 | 5 | 2 | 6 | |
| SUM | 14 | 15 | 21 | 10 | 23 | 19 | 26 | |
| Mean rank | 2.8 | 3 | 4.2 | 2 | 4.6 | 3.8 | 5.2 | |
| Final rank | 2 | 3 | 5 | 1 | 6 | 4 | 7 | |
| COVID3 | 2 | 4 | 6 | 7 | 5 | 2 | 1 | 3 |
| 3 | 7 | 3 | 1 | 5 | 4 | 6 | 2 | |
| 4 | 6 | 7 | 4 | 1 | 5 | 3 | 2 | |
| 5 | 3 | 5 | 6 | 1 | 4 | 2 | 7 | |
| 6 | 2 | 7 | 4 | 1 | 4 | 3 | 5 | |
| SUM | 19 | 23 | 17 | 13 | 19 | 15 | 16 | |
| Mean rank | 3.8 | 4.6 | 3.4 | 2.6 | 3.8 | 3 | 3.2 | |
| Final rank | 5 | 6 | 4 | 1 | 5 | 2 | 3 |