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Fig. 6. Regression model (Table 4) evaluation. Modeled vs. measured prediction efficiency for (a) the data that was used to generate the model, (b) the original data with the exception of pH and buffer pH values from the Calloway, Hopkins, Hardin, Nelson, and Michigan locations, the original data from the pH and buffer pH values from the Calloway, Hopkins, Hardin, Nelson, and Michigan locations, and (d) reported results from Kravchenko (2003). RMSEs and errors of accuracy (ACC) and precision (PREC) listed. Accuracy and precision have been defined Eq. [2] and [3], respectively.
