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B. M. J. K. Balasooriya et al.
Table 5.1 Proportion of variance using varimax rotation and communality estimates of groundwater
quality parameters in Sri Lanka
Variables
VF1
VF2
VF3
VF4
VF5
VF6
Communality
estimates
Fluoride
(mg/L)
0.171 −0.035
0.023
0.571 −0.241
0.007 0.415
EC (µS/cm)
0.957 −0.05
0.001
0.188
0.093 −0.005 0.962
pH
0.319 −0.142 −0.146
0.71
0.117 −0.069 0.666
Chloride
(mg/L)
0.904
0.002
0.046
0.002
0.075 −0.004 0.825
Sulphate
(mg/L)
0.808
0.029
0.023 −0.097
0.051
0.015 0.666
Nitrate
(mg/L)
0.15
0.001
0.078 −0.281
0.639
0.121 0.53
Sodium
(mg/L)
0.867
0
0.014
0.135 −0.006 −0.006 0.77
Magnesium
(mg/L)
0.796 −0.075
0.008
0.267 −0.038 −0.01
0.713
Calcium
(mg/L)
0.732 −0.097 −0.022
0.197
0.249 −0.001 0.646
Aluminium
(µg/L)
−0.062
0.879
0.095 −0.152
0.008
0.019 0.809
Chromium
(µg/L)
−0.016
0.158
0.116
0.535
0.451
0.117 0.543
Ferrous
(µg/L)
−0.043
0.884 −0.017
0.072
0.009 −0.017 0.789
Nickel
(µg/L)
0.187
0.135
0.556
0.058 −0.004
0.039 0.368
Copper
(µg/L)
−0.041 −0.022
0.695
0.004
0.008 −0.038 0.487
Zinc (µg/L) −0.109 −0.056
0.755 −0.148
0.112 −0.041 0.621
Arsenic
(µg/L)
0.127 −0.019 −0.032
0.142
0.677 −0.151 0.518
Cadmium
(µg/L)
0.038
0.08
0.377
0.108 −0.21
0.391 0.359
Lead
(µg/L)
−0.025 −0.034 −0.089 −0.042
0.05
0.897 0.819
Eigenvalue
4.878
1.802
1.441
1.202
1.177
1.005 –
% Total
Variance
25.183
9.157
8.709
8.085
7.119
5.666 –
Cumulative
% Variance
25.183
34.34
43.04
51.13
58.25
63.92
–
Bold, italic values indicate strong (>0.75), and bold values indicate moderate (0.75–0.50) loadings,
respectively