Rockefeller University Press

Table II

Dependence of Branching Rate on the Limit to Asymmetry

ζ^low	λ	R²	λ₁[cm⁻¹]	R²
0	0.978	0.909	−0.0825	0.981
0.1	0.974	0.939	−0.0838	0.983
0.2	0.947	0.986	−0.0917	0.986
0.3	0.904	0.993	−0.0917	0.976
0.4	0.883	0.995	−0.1009	0.985

ζ^low	λ	R²	λ₁[cm⁻¹]	R²
0	0.978	0.909	−0.0825	0.981
0.1	0.974	0.939	−0.0838	0.983
0.2	0.947	0.986	−0.0917	0.986
0.3	0.904	0.993	−0.0917	0.976
0.4	0.883	0.995	−0.1009	0.985

For each value of ζ^low the average branching rate λ along the “main path” of each tree was computed from the slope of a linear regression of log(r_n/ r₀) versus n, cf. Eq. 11. These regressions against the structural variable n were seen to discriminate well between trees. Conversely, regressions for r_n/r₀ over the metric path lengths (regression slope λ₁) failed to discriminate between trees. R² is the ratio of explained variance (i.e., R² = Sum of Squares (Model)/Sum of Squares (total), used as the criterion for the goodness of fit.

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