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每日翻译20190606

已有 249 次阅读 2019-6-6 07:23 |个人分类:翻译作品|系统分类:科研笔记| 种内, 种间, 样本量, 计算量, 计算时间


Large sample sizes

Appropriate sampling can be crucial to   phylogenetic studies5. Typically, intraspecific studies involve   many individuals for comparison, whereas many interspecific phylogenetic   studies tend to be based on one representative individual per species.   Because of the density of sampling, especially when coupled with low   divergence, intraspecific data sets reach considerable sample sizes   (>100). These large sample sizes would require excessive computational   time for most methods that have been developed for interspecific comparisons.  

大样本量

适当的采样对系统发育研究至关重要5。通常,种内研究涉及许多个体进行比较,而许多种间系统发育研究往往基于各物种的一个有代表性个体。由于采样的密度,特别是在低分化的情况下,种内数据集常常达到相当大的样本量(>100)。对于大多数已开发用于种间比较的方法,这些大样本量将需要过多的计算时间。

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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