University of Maryland Genealogical Sorting Index  
Michael P. CummingsMaile C. NeelKerry L. ShawAdam L. Bazinet
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Genealogical Sorting Index
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Genealogical Sorting Index

There are several situations in which it is desirable to quantify the degree of exclusive association among observations in groups that are represented on a tree. For example, in the context of evolutionary biology, quantifying the degree of genealogical sorting and allelic histories is important for assessing the degree of differentiation of species and populations or subpopulations, and is essential for understanding conservation status and priority of particular organisms. The genealogical sorting index (gsi) quantifies the historical relationships among groups for any genealogy to enable novel insight into the evolutionary process. It is intuitive, simple, and easily calculated. The software that calculates the genealogical sorting index and measures its significance is made freely available.


1) Upload a rooted tree file containing only representatives for groups you wish to analyze. The file must be in Newick (Phylip) or Weighted Newick format, which is a common tree format produced by many programs, and may contain at most 100 trees. Also, be sure the file contains only plain text! Here are some sample files.



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Maintained by Adam Bazinet
Direct questions and comments to Michael Cummings