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Appendix 3: Regression Analyses

Table A3-A: Regression analyses

Water-quality variable Correlation (r2) with water-quality (predictor) variable
% Dairy Average annual rainfall Mean or median annual stream flow Other
Total nitrogen 0.24
(n = 14)		 0.17
(n = 14)		 < 0.01
(n = 8)		  
Nitrate–nitrite nitrogen 0.19
(n = 14)		 0.14
(n = 14)		 < 0.01
(n = 8)		 Conductivity = 0.33 (n = 14)
Conductivity = 0.58 (n = 13, Puwera excluded)
Soluble inorganic nitrogen 0.22
(n = 14)		 0.14
(n = 14)		 < 0.01
(n = 8)		  
Total phosphorus 0.11
(n = 14)		 < 0.01
(n = 14)		 0.18
(n = 8)		  
Dissolved reactive phosphorus 0.16
(n = 14)		 0.04
(n = 14)		 0.11
(n = 8)		  
Ammonia nitrogen 0.18
(n = 10)		 0.41
(n = 10)		 0.11
(n = 7)		  
Conductivity 0.33
(n = 13)		 0.19
(n = 13)		 0.16
(n = 7)		  
Suspended solids 0.12
(n = 14)		 < 0.01
(n = 14)		 < 0.01
(n = 8)		 Turbidity = 0.54 (n = 12)
Turbidity 0.05
(n = 13)		 < 0.01
(n = 13)		 0.17
(n = 7)		  
E. coli 0.22
(n = 14)		 0.11
(n = 14)		 0.18
(n = 8)		  
MCI < 0.01
(n = 8)
0.27
(n = 7*)		 0.13
(n = 8)		 0.89**
(n = 6)		  
QMCI < 0.01
(n = 9)
0.35
(n = 8*)		 0.02
(n = 9)		 0.79**
(n = 5)		  

* Waiokura excluded.
** Logarithmic trend line fit.

 

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