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Different combinations of input variables to predict the WQI.
| Group number | Input variables |
|---|---|
| 1 | TP |
| 2 | TP, AN |
| 3 | TP, AN, DO |
| 4 | TP, AN, DO, COM |
| 5 | TP, AN, DO, COM, pH |
| 6 | TP, AN, DO, COM, pH, WT |
| 7 | TP, AN, DO, COM, pH, WT, TN |
| 8 | TP, AN, DO, COM, pH, WT, TN, Tur |
| 9 | TP, AN, DO, COM, pH, WT, TN, Tur, EC |
