UpdownDistance is a tool for evaluating closeness of tree matches when comparing a query tree P with a data tree D where both P and D are phylogenetic trees. The method computes the Updown distance between P and D
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Jason T. L. Wang, Huiyuan Shan, Dennis Shasha and William H. Piel,
“Fast Structural Search in Phylogenetic Databases,”
Evolutionary Bioinformatics Online, Volume 1, 2005, pp. 37-46.