yule(phy, use.root.edge = FALSE)"phylo".The maximum likelihood estimate of the speciation rate is obtained by the ratio of the number of speciation events on the cumulative number of species through time; these two quantities are obtained with the number of nodes in the tree, and the sum of the branch lengths, respectively.
If there is a `root.edge' element in the phylogenetic tree, and
use.root.edge = TRUE, then it is assumed that it has a
biological meaning and is counted as a branch length, and the root is
counted as a speciation event; otherwise the number of speciation
events is the number of nodes - 1.
The standard-error of lambda is computed with the second derivative of the log-likelihood function.
branching.times, diversi.gof,
diversi.time, ltt.plot,
birthdeath, bd.ext, yule.cov