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The efficiency gap is the difference between the parties’ respective inefficient votes in an election divided by the total number of votes cast. Learn more about the Efficiency Gap


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This Plan
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Balanced
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Partisan bias is the difference between each party’s seat share and 50% in a hypothetical, perfectly tied election. Learn more about Partisan Bias


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This Plan
+% D
Balanced
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The mean-median difference is a party’s median vote share minus its mean vote share, across all of a plan’s districts. Learn more about Mean-Median


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This Plan
+ D
Balanced
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The declination metric treats asymmetry in the distribution of votes across districts as indicative of partisan bias in a districting plan. Learn more about Declination 


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We do not show data on the partisan fairness metrics in states with less than seven districts because the metrics in these states tend to be more volatile and thus less informative about partisan bias. For example, in a state with only three congressional seats, a change in the winner of one seat could cause a huge shift in their efficiency gap.

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We do not show data on the partisan fairness metrics in states with less than seven districts because the metrics in these states tend to be more volatile and thus less informative about partisan bias. For example, in a state with only three congressional seats, a change in the winner of one seat could cause a huge shift in their efficiency gap.

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