A Comparative Assessment of the Influences of Human Impacts on Soil Cd Concentrations Based on Stepwise Linear Regression, Classification and Regression Tree, and Random Forest Models.

Results and Discussion Relative importance of the predictor variables The estimated ELE, pH, and Dmetal parameters were all highly significant at the P < 0.001 level, and Dtown was significant at P < 0.05 ( Table 2 ).

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