Research Article
Temporal Aspects of Surface Water Quality Variation Using Robust Statistical Tools
Table 3
Wet season classification function for discriminant analysis (DA) of parameters in mg/L except for temperature, conductivity, and pH.
| Variable | Standard mode | Forward stepwise mode | Backward stepwise mode | Lambda | value | Lambda | value | Lambda | value |
| DO |
0.914
|
0.011
|
0.914
|
0.011
|
0.914
|
0.011
| BOD5 |
0.851
|
0.001
|
0.851
|
0.001
| | | COD |
0.839
|
0.035
|
0.839
|
0.035
|
0.839
|
0.035
| SS |
0.983
|
0.021
|
0.983
|
0.021
|
0.983
|
0.021
| pH |
0.962
|
0.482
| | | | | NH3 |
0.956
|
0.426
| | | | | Temperature |
0.908
|
0.160
| | | | | Conductivity |
0.902
|
0.141
| | | | | Salinity |
0.903
|
0.144
| | |
0.903
|
0.144
| Turbidity |
0.878
|
0.084
| | |
0.878
|
0.084
| DS |
0.906
|
0.152
| | | | | TS |
0.894
|
0.120
| | |
0.894
|
0.120
| NO3 |
0.954
|
0.406
| | | | | |
0.912
|
0.001
|
0.912
|
0.001
| | | |
0.969
|
0.553
| | | | |
| Wilk’s lambda |
0.25
| |
0.84
| |
0.48
| | Chi-square |
1.82
| |
1.96
| |
88.45
| | level | 0.01 | | 0.03 | | 0.01 | |
|
|