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. 1997 Feb 1;109(2):129–140. doi: 10.1085/jgp.109.2.129

Table II.

Dependence of Branching Rate on the Limit to Asymmetry

ζlow 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 ζlow 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/ r 0) versus n, cf. Eq. 11. These regressions against the structural variable n were seen to discriminate well between trees. Conversely, regressions for r n/r 0 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.