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Herfindahl Index

The Herfindahl Index is most commonly used in economics to measure the market share of industries.  Applied to religion, it assesses the “evenness” of religious groups pertaining to the overall market of adherents in a geo-political area.  Its use to predict attendance or adherence rates has been controversial, since a “mathematical relationship between [the] variables” may cause potentially erroneous results (Voas et al. 2002: 212).

Citations:

Voas, David, Daniel V. A. Olson and Alasdair Crockett.  2002.  “Religious Pluralism and Participation: Why Previous Research is Wrong.”  American Sociological Review 67(2): 212-230.

Several files in theARDA's Data Archive have examples of this Measure.
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