# pymatgen.analysis.hhi module

This module is used to estimate the Herfindahl-Hirschman Index, or HHI, of chemical compounds. The HHI is a measure of how geographically confined or dispersed the elements comprising a compound are. A low HHI is desirable because it means the component elements are geographically dispersed.

Data/strategy from “Data-Driven Review of Thermoelectric Materials: Performance and Resource Considerations” by Gaultois et al., published in Chemistry of Materials (2013).