Historical glottometry
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Historical Glottometry is a method used in historical linguistics. It is a quantitative, non-cladistic approach to language subgrouping.
The aim of Historical Glottometry (HG) is to address the limitations of the tree model when applied to dialect continua and linkages. It acknowledges that the genealogical structure of a linkage typically consists of entangled subgroups, and provides ways to reconstruct that internal structure by measuring the relative strength of these subgroups.
This approach was developed by Alexandre François (CNRS) and Siva Kalyan (ANU).[1][2][3] While the method was initially applied to Oceanic languages, in recent years it has been applied to a much broader range of language families.