| Standard deviation | Mean deviation percent | Method |
| 195.7 | −107.3 | Poettmann, Carpenter |
| 195.1 | −108.3 | Baxendell, Thomas |
| 36.1 | −5.5 | Fancher, Brown |
| 50.2 | −15.4 | Duns, Ros |
| 26.1 | −1.3 | Hagedorn, Brown |
| 35.7 | −8.6 | Orkiszewski |
| 27.6 | −17.8 | Beggs, Brill |
| 34.7 | +8.2 | Aziz et al. |
| 43.9 | +42.8 | Chierici et al. |