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#编者信息
熊荣川
明湖实验室
xiongrongchuan@126.com
http://blog.sciencenet.cn/u/Bearjazz
Pyramids The pyramids technique is an extension of the hierarchical clustering framework. Whereas traditional hierarchical methods such as Unweighted Pair Group with Arithmetic Means (UPGAM) represent a nested set of nonoverlapping clades, pyramids represent a set of clades that can overlap without necessarily being nested. The input data is a (Robinsonian) distance matrix (Box 1). The pyramid is obtained by using agglomerative algorithms. By allowing overlapping clusters, pyramids can be used to represent reticulate events, although these events are only allowed to be placed among terminal nodes that are sister taxa.
| 金字塔 金字塔拓扑结构是层次聚类框架的扩展。传统的层次方法,如不加权算术平均组对方法(UPGAM)表示一组嵌套的非重叠族,而金字塔表示一组可以重叠而不必嵌套的族。输入数据为(Robinsonian)距离矩阵(框注1)。金字塔是用凝聚算法得到的。通过允许重叠的集群,金字塔可以用来表示网状事件,尽管这些事件只允许放置在作为姊妹分类群的终端节点之间。 |
Posada D , Crandall K A . Intraspecific gene genealogies: trees grafting into networks[J]. Trends in Ecology and Evolution, 2001, 16(1):0-45. |
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