Electoral concentration is a measure of the accumulation of votes in the two most voted parties of a given territorial unit. It is the cumulative fraction of valid votes obtained by the two most voted parties in a given election (Consejo Nacional Electoral - Ecuador, 2014).
The formula is:
concentration = p1 + p2
where p1 is the vote/seat proportion for the most voted party, and p2 is the vote/seat proportion for the second most voted party. Thus, it requires elections with at least 2 parties.
The index is a number positive up to 1. A value of 1 means maximum concentration (p1 + p2 = 1, i.e. pi = 0 for i = 3,4...)
Developed by Jorge Albuja Delgado ([email protected]).
greater-than-1-length vector of number o proportion of votes/seats per party
A single numeric with concentration value in the interval (0, 1].
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