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Table 3 Regression analysis of COD and NH3-N pollutants

From: Characterizing and explaining spatio-temporal variation of water quality in a highly disturbed river by multi-statistical techniques

Station COD NH3-N
Const β T β Q F sig R 2 adj VIF Cl Const β T β Q F sig R 2 adj VIF Cl
Baidukou 1.5627 0.0020 0.0017 0.01 0.28 1.01 4.89 1.0625 0.0104 0.0078 0.01 0.40 1.01 4.89
Zhifang 1.2708 0.0014 0.0015 0.01 0.17 1.08 4.09 0.2282 0.0067 0.0125 0.01 0.15 1.08 4.09
Chengwan 1.2321 −0.0032 0.60 0.04 1.12 4.33 0.1321 0.0391 0.001 0.01 0.38 1.12 4.87
Lifen 1.3748 0.0012 0.02 0.01 1.00 2.94
Zhidian 1.3933 −0.0030 0.0004 0.01 0.17 1.24 4.85 0.603 0.0190 0.0005 0.01 0.50 1.24 4.85
  1. Estimated coefficients (Const: constant intercept, \(\beta_{T}\): water temperature, \(\beta_{Q}\): water discharge) in bolditalic or italic mean 0.05 or 0.10 significant level of t test). \(F_{sig}\) and \(R_{adj}^{2}\) are the significant level of F test and determination coefficient for the estimated model. VIF and Cl are variance inflation factor and maximum condition index