For a given node, this function gives the number of tips descending from each of its two children, as a measure of imbalance.
a tree of class
a node index between 1 and 2n-1, where n is the number of tips in the tree.
Two integers corresponding to the number of tip descendants of each of the node's two children. If the node is itself a tip, then the vector (0,0) will be returned.
Michelle Kendall [email protected]
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