Evaluating Partisan Gerrymandering in Wisconsin

Ravier, R

Mattingly, J

Herschlag, GJ

2017-09-07T12:44:53Z

2017-09-07T12:44:53Z

2017-09-07

We examine the extent of gerrymandering for the 2010 General Assembly district map of Wisconsin. We find that there is substantial variability in the election outcome depending on what maps are used. We also found robust evidence that the district maps are highly gerrymandered and that this gerrymandering likely altered the partisan make up of the Wisconsin General Assembly in some elections. Compared to the distribution of possible redistricting plans for the General Assembly, Wisconsin's chosen plan is an outlier in that it yields results that are highly skewed to the Republicans when the statewide proportion of Democratic votes comprises more than 50-52% of the overall vote (with the precise threshold depending on the election considered). Wisconsin's plan acts to preserve the Republican majority by providing extra Republican seats even when the Democratic vote increases into the range when the balance of power would shift for the vast majority of redistricting plans.

http://arxiv.org/abs/1709.01596v1

https://hdl.handle.net/10161/15452

stat.AP

stat.AP

physics.soc-ph

97A40, 91F10, 65C05

Evaluating Partisan Gerrymandering in Wisconsin

Journal article

Mattingly, J|0000-0002-1819-729X

Herschlag, GJ|0000-0001-5443-6449

http://arxiv.org/abs/1709.01596v1

Slightly updated version of initially released report dated September 2, 2017. Typos were corrected and some wording improved

Duke

Mathematics

Statistical Science

Trinity College of Arts & Sciences