An edge may also have additional properties. For instance, the weight of an edge may correspond to the importance or support of the edge so that a large weight suggests that the edge is very important or that it has high statistical support whereas a low weight suggests the opposite. The length of an edge in a phylogenetic tree or network, on the other hand, often represents temporal difference or a mutation rate (or a combination of them) so that any two taxa at opposite ends of a long edge tend to be more different from one another than two other taxa at the opposite ends of a short edge.
See also: graph.
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