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Suppose there exists a distinct number of groups spread across the districts of an electoral map (by race, language, or some other delineation.) The routine voting.power calculates the power of an electoral group by estimating the probability that a vote from this group has in changing the result of an election, by flipping the outcome of districts in which they live.
If the option pop.groups is specified in the original judgeit command, no further options are required. If not, use the syntax
voting.power(j.ob,new.pop.groups=matrix1)
where matrix1 represents the voters in each group within each district.