Table 5.
Friedman ranking test for the methods of PSNR for COVID-19 experiment
| PSNR_rank | K | AO | WOA | SSA | RSA-SSA | RSA | MPA | PSO |
|---|---|---|---|---|---|---|---|---|
| COVID1 | 2 | 1 | 5 | 6 | 2 | 3 | 7 | 4 |
| 3 | 1 | 3 | 5 | 2 | 4 | 6 | 7 | |
| 4 | 4 | 7 | 2 | 5 | 1 | 3 | 6 | |
| 5 | 3 | 5 | 6 | 2 | 1 | 4 | 7 | |
| 6 | 7 | 1 | 4 | 2 | 5 | 3 | 6 | |
| SUM | 14 | 15 | 23 | 13 | 14 | 19 | 21 | |
| Mean rank | 2.8 | 3 | 4.6 | 2.6 | 2.8 | 3.8 | 4.2 | |
| Final rank | 2 | 3 | 6 | 1 | 2 | 4 | 5 | |
| COVID2 | 2 | 1 | 5 | 7 | 2 | 4 | 6 | 3 |
| 3 | 2 | 5 | 4 | 1 | 6 | 3 | 7 | |
| 4 | 3 | 7 | 6 | 2 | 4 | 1 | 5 | |
| 5 | 3 | 7 | 6 | 4 | 2 | 1 | 5 | |
| 6 | 6 | 3 | 5 | 2 | 1 | 7 | 4 | |
| SUM | 15 | 19 | 25 | 11 | 17 | 12 | 23 | |
| Mean rank | 3 | 3.8 | 5 | 2.2 | 3.4 | 2.4 | 4.6 | |
| Final rank | 3 | 5 | 7 | 1 | 4 | 2 | 6 | |
| COVID3 | 2 | 5 | 7 | 2 | 4 | 6 | 1 | 3 |
| 3 | 4 | 3 | 1 | 5 | 6 | 7 | 2 | |
| 4 | 6 | 5 | 4 | 1 | 2 | 3 | 7 | |
| 5 | 7 | 5 | 6 | 1 | 4 | 3 | 2 | |
| 6 | 1 | 5 | 4 | 2 | 7 | 3 | 6 | |
| SUM | 20 | 24 | 17 | 13 | 25 | 16 | 15 | |
| Mean rank | 4 | 4.8 | 3.4 | 2.6 | 5 | 3.2 | 3 | |
| Final rank | 5 | 6 | 4 | 1 | 7 | 3 | 2 |