An Application of the "Efficiency Gap" Measure to Redistricting in Oregon

  •  Priscilla L. Southwell    


This is a preliminary application of McGhee and Stephanopoulos’s efficiency gap measure to the state of Oregon for elections from 2012-2016. This is one of the measures currently being considered by the U.S. Supreme Court in the Gill v. Whitford gerrymandering case. Our results suggest that the current configuration of U.S, House districts minimizes the impact of a sizeable statewide Republican vote (@41-42%) that results in only 20% of the seats being given to this party. This disparity is less apparent in state senate and house seats, although the Democratic Party was at a distinct disadvantage in 2016 state senate elections. We also note the growing number of uncontested elections since this redistricting plan was first adopted in 2012.

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