| COD | Color units | |||||||||||
| Factor | (mg/L) | CU | ||||||||||
| SS | DF | MS | F-value | Test > f | RC | SS | DF | MS | F-value | Test > f | RC | |
| Model | 38822 | 3 | 12941 | 101.3 | 0.0098 | 748 | 3755 | 3 | 1252 | 40.38 | 0.0243 | 211 |
| X1 | 5929 | 1 | 5929 | 46.41 | 0.0209 | 38.5 | 441 | 1 | 441 | 14.23 | 0.0637 | 1 |
| X2 | 32761 | 1 | 32761 | 256.45 | 0.0039 | -90.5 | 3025 | 1 | 3025 | 97.58 | 0.0101 | −27.5 |
| X1 X2 | 132.2 | 1 | 132 | 1.04 | 0.416 | 1 | 289 | 1 | 289 | 9.32 | 0.0926 | 1 |
| Pure Error | 255 | 1 | 127 | 4.97 | 0.1555 | 1701 | 1 | 31 | ||||
| Total Correlation | 39713 | 6 | 5518 | 6 | ||||||||
| R2 | 0.98 | R2 | 0.95 | |||||||||
| Adq. Precision | 27 | Adq. Precision | 16.5 | |||||||||