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• W3148926317 abstract "Several tests of molecular phylogenies have been proposed over the last decades, but most of them lead to strikingly different P-values. I propose that such discrepancies are principally due to different forms of null hypotheses. To support this hypothesis, two new tests are described. Both consider the composite null hypothesis that all the topologies are equidistant from the true but unknown topology. This composite hypothesis can either be reduced to the simple hypothesis at the least favorable distribution (frequentist significance test (FST)) or to the maximum likelihood topology (frequentist hypothesis test (FHT)). In both cases, the reduced null hypothesis is tested against each topology included in the analysis. The tests proposed have an information-theoretic justification, and the distribution of their test statistic is estimated by a nonparametric bootstrap, adjusting P-values for multiple comparisons. I applied the new tests to the reanalysis of two chloroplast genes, psaA and psbB, and compared the results with those of previously described tests. As expected, the FST and the FHT behaved approximately like the Shimodaira-Hasegawa test and the bootstrap, respectively. Although the tests give overconfidence in a wrong tree when an overly simple nucleotide substitution model is assumed, more complex models incorporating heterogeneity among codon positions resolve some conflicts. To further investigate the influence of the null hypothesis, a power study was conducted. Simulations showed that FST and the Shimodaira-Hasegawa test are the least powerful and FHT is the most powerful across the parameter space. Although the size of all the tests is affected by misspecification, the two new tests appear more robust against misspecification of the model of evolution and consistently supported the hypothesis that the Gnetales are nested within gymnosperms. (Approximately unbiased test; bootstrap proportion; hypothesis test; P-value adjustment; Shimodaira-Hasegawa test; significance test.)" @default.
• W3148926317 created "2021-04-13" @default.
• W3148926317 creator A5083730230 @default.
• W3148926317 date "2003-12-01" @default.
• W3148926317 modified "2023-10-17" @default.
• W3148926317 title "Least and Most Powerful Phylogenetic Tests to Elucidate the Origin of the Seed Plants in the Presence of Conflicting Signals under Misspecified Models" @default.
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• W3148926317 doi "https://doi.org/10.1080/10635150390258949" @default.
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