Assertion: correlation's value | /r/CapableOf | indicate optimal adjustment
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text: Values near zero indicate optimal adjustment, while positive and negative values indicate underestimation and overestimation of predicted values, respectively (BONFANTE et al., 2010); Coefficient of correlation (r)--varies between -1 and +1, with values close to zero indicating the absence of correlation (ADDISCOTT & WHITMORE, 1987); Willmott's index of agreement (d)--indicates model accuracy and degree of discrepancy between actual and predicted values, with values between zero and +1, where d=+1 indicates perfect agreement, and d=0 indicates total disagreement (WILLMOTT et al., 2012); Coefficient "c"--indicates the model confidence and is expressed by c=d*r, varying between <0.40 ("low") and >0.85 ("optimum") (CAMARGO & SENTELHAS, 1997).