Comparison of the scaling exponent and constant estimated by different regression methods.

RMA: Reduced major axis regression; MAR: Major axis regression; LSR: Linear regression on log-log transformed data; NLS: Weighted non-linear regression. DBH: diameter at breast height. The scaling constants for RMA, MAR, and LSR were reverse transformed. For any grouping method, the exponent and constant presented here is the average of the exponent or constant estimated for each of the 8 categories in that group. Isometric relationship values are the number of times that the 95% and 99% confidence intervals of scaling exponent estimations, respectively, included 1 (followed by the percentage for each). The total number of scaling exponents estimated was 57.