Skip to Main Content
Table 1

Correlation coefficients for E. coli, black disc visual clarity, turbidity, and (normalised) discharge at NZ river sites. Data are from 64 sites in the NRWQN sampled monthly between 2005 and 2015 inclusive. (The turbidity record was truncated after 2011 so as to avoid a step-change with change in bench nephelometer.) Values below the diagonal are Pearson's product moment correlation coefficients on log10-transformed data, and values above the line are spearman's rank correlation coefficients

E. coliVisual clarityTurbidityDischarge
E. coli −0.53 0.53 0.24 
Visual clarity −0.54 −0.93 −0.57 
Turbidity 0.50 −0.94 0.57 
Discharge (normalised) 0.29 −0.60 0.58 
E. coliVisual clarityTurbidityDischarge
E. coli −0.53 0.53 0.24 
Visual clarity −0.54 −0.93 −0.57 
Turbidity 0.50 −0.94 0.57 
Discharge (normalised) 0.29 −0.60 0.58 
Close Modal

or Create an Account

Close Modal
Close Modal