Calculate the fraction of internal nodes with an imbalance greater than or equal to a given threshold.
a tree of class
a threshold value for node imbalance.
For any internal node, the function
nodeImb gives the number of tip descendants of each of the node's descending branches. The function
nodeImbFrac returns the fraction of internal nodes where the difference between these numbers is greater than or equal to the threshold.
Michelle Kendall [email protected]
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