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|`-alninfo`| Print alignment site statistics to `.alninfo` file. |
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|`-blfix`| Fix branch lengths of tree passed via `-t` or `-te`. This is useful to evaluate the log-likelihood of an input tree with fixed tolopogy and branch lengths. *DEFAULT: OFF*|
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|`-blmin`| Specify minimum branch length. Default: the smaller of 0.000001 and alignment length divided by 10. |
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|`-blmin`| Specify minimum branch length. Default: the smaller of 0.000001 and 0.1/alignment_length. |
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|`-blmax`| Specify the maximum branch length. Default: 10 |
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|`-czb`| Collapse near zero branches, so that the final tree may be multifurcating. This is useful for bootstrapping in the presence of polytomy to reduce bootstrap supports of short branches. |
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|`-me`| Specify the log-likelihood epsilon for final model parameter estimation (Default: 0.01). With `-fast` option, the epsilon is raised to 0.05. |
Copy file name to clipboardExpand all lines: doc/Concordance-Factor.md
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layout: userdoc
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title: "Concordance Factor"
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author: M Bui
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date: 2019-12-01
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docid: 6
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date: 2020-05-08
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docid: 5
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icon: info-circle
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doctype: tutorial
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tags:
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Since IQ-TREE 2, we provide two measures for quantifying genealogical concordance in phylogenomic datasets: the gene concordance factor (gCF) and the site concordance factor (sCF). For every branch of a reference tree, gCF is defined as the percentage of “decisive” gene trees containing that branch. gCF is already in wide usage, but here we allow to calculate gCF while correctly accounting for variable taxon coverage among the gene trees. sCF is defined as the percentage of decisive alignment sites supporting a branch in the reference tree. sCF is a novel measure that is particularly useful when individual gene alignments are relatively uninformative, such that gene trees are uncertain. gCF and sCF complement classical measures of branch support (e.g. bootstrap) in phylogenetics by providing a full description of underlying disagreement among loci and sites.
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If you use this feature please cite: __Minh B.Q., Hahn M., Lanfear R.__ (2018) New methods to calculate concordance factors for phylogenomic datasets. <https://doi.org/10.1101/487801>
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If you use this feature please cite:
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__Minh B.Q., Hahn M.W., Lanfear R.__ (2020) New methods to calculate concordance factors for phylogenomic datasets. _Molecular Biology and Evolution_, in press. <https://doi.org/10.1093/molbev/msaa106>
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>**NOTE**: For this feature please use IQ-TREE version 2!
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