A standardized effect size for evaluating and comparing the strength of phylogenetic signal
A standardized effect size for evaluating and comparing the strength of phylogenetic signal
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DOI：
10.1111/2041-210x.13749
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发表时间：
2021-11-08
影响因子：
6.6
通讯作者：
Adams, Dean C.
中科院分区：
文献类型：
--
作者：
Collyer, Michael L.;Baken, Erica K.;Adams, Dean C.
宏观进化研究经常表征表型中的系统发育信号;然而，用于比较该信号在性状之间的强度的分析工具在很大程度上仍然不发达。我们开发了一个非参数的，排列测试的对数似然的进化模型，加上标准化的统计量，Z，从这个测试，这可以被认为是一个系统发育的信号效应大小。该统计量可用于双样本检验，以比较多个性状的系统发育信号的强度。我们进行了模拟实验，揭示了Z与Pagel的λ，这可以预测的树的大小，加上可以快速解释为一个假设的系统发育信号的基础上，一个标准的正态分布的线性关联。我们还发现，排列测试有更大的统计功率检测系统发育信号比参数似然比测试，特别是对小树。我们提出的分析框架扩展了系统发育比较方法工具包，允许多个性状的系统发育信号的统计比较。未来的研究也可以考虑这个框架的比较不同的进化模型，特别是在不同的零过程。
Macroevolutionary studies frequently characterize the phylogenetic signal in phenotypes; however, analytical tools for comparing the strength of that signal across traits remain largely underdeveloped. We developed a non-parametric, permutation test for the log-likelihood of an evolutionary model, plus a standardized statistic, Z, from this test, which can be considered a phylogenetic signal effect size. This statistic can be used in two-sample tests to compare the strength of phylogenetic signal for multiple traits. We performed simulation experiments that revealed that Z had a linear association with Pagel's lambda, which could be predicted by tree size, plus could be quickly interpreted as a hypothesis for phylogenetic signal based on a standard normal distribution. We additionally found that the permutation test had greater statistical power for detecting phylogenetic signal than parametric likelihood ratio tests, especially for small trees. The analytical framework we present extends the phylogenetic comparative methods toolkit, allowing for statistical comparison of phylogenetic signal in multiple traits. Future studies could also consider this framework for the comparison of different evolutionary models, especially in light of different null processes.