Table 6.
Varimax rotation PCs for water quality data within Malacca River basin.
| Variables (unit) | Principle component | ||||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
| Turbidity (NTU) | −.084 | .761 | .020 | .162 | .154 | −.087 | −.040 |
| Dissolved solid (mg/l) | .806 | −.048 | .016 | −.087 | .093 | .111 | −.021 |
| Electrical conductivity (uS) | .924 | .011 | .045 | −.034 | −.120 | .050 | .003 |
| Salinity (ppt) | .913 | −.018 | .010 | −.014 | .064 | .031 | .007 |
| Temperature (°C) | .024 | −.290 | .318 | −.370 | −.525 | .011 | −.229 |
| Dissolved oxygen (mg/l) | −.127 | .254 | −.207 | −.184 | .051 | −.636 | −.095 |
| Biological oxygen demand (mg/l) | −.070 | −.154 | .806 | −.074 | .089 | .053 | −.014 |
| Chemical oxygen demand (mg/l) | .233 | .186 | .781 | .087 | −.005 | .083 | .041 |
| Total suspended solid (mg/l) | .056 | .816 | −.061 | −.005 | −.181 | −.184 | −.033 |
| Acidity/alkalinity (pH) | .454 | −.009 | .198 | −.396 | −.546 | −.084 | −.023 |
| Ammoniacal nitrogen (mg/l) | −.149 | −.291 | .549 | −.275 | −.124 | .385 | −.301 |
| E. coli (cfu/100 ml) | .113 | −.133 | .076 | .000 | .105 | .679 | −.047 |
| Coliform (cfu/100 ml) | −.001 | −.188 | −.019 | .178 | .500 | .602 | .497 |
| Arsenic (mg/l) | .130 | −.017 | .217 | −.124 | .763 | .048 | −.155 |
| Mercury (mg/l) | −.001 | −.009 | .068 | −.065 | −.064 | −.013 | .870 |
| Chromium (mg/l) | −.079 | .507 | −.092 | −.113 | .008 | .015 | −.062 |
| Zinc (mg/l) | .089 | .080 | .014 | .855 | .059 | .056 | .106 |
| Iron (mg/l) | −.319 | .023 | −.056 | .746 | .018 | −.008 | −.173 |
| Initial eigenvalue | 3.297 | 2.797 | 2.357 | 2.061 | 1.856 | 1.821 | 1.535 |
| % of variance | 15.539 | 10.310 | 10.115 | 10.024 | 8.526 | 8.088 | 6.852 |
| Cumulative % | 15.539 | 25.849 | 35.964 | 45.987 | 54.514 | 62.602 | 69.455 |
∗The bold values are factor loadings above 0.6 that were taken after Varimax rotation is performed.