Polarization

Polarization is a measure of how likely the districts in a plan will stay with their parties. A low polarization score indicates that the districts in a plan are more responsive to changes in the electoral mood and reflects the overall competitiveness of the districts.

The polarization score is based on the PVI of the districts in a plan:

For each highly competitive district (PVI 0 or 1) add 0

For each competitive district (PVI 2 through 5) add +1

For each noncompetitive district (PVI greater than 5) add +2

The total is the POLARIZATION score for the plan.