Mathematics of Nested Districts: The Case of Alaska

In eight states, a "nesting rule" requires that each state Senate district be exactly composed of two adjacent state House districts. In this article, we investigate the potential impacts of these nesting rules with a focus on Alaska, where Republicans have a 2/3 majority in the Senate whi...

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Bibliographic Details
Published in:Statistics and public policy (Philadelphia, Pa.) Pa.), 2020-01, Vol.7 (1), p.39-51
Main Authors: Caldera, Sophia, DeFord, Daryl, Duchin, Moon, Gutekunst, Samuel C., Nix, Cara
Format: Article
Language:English
Subjects:
Districts
Gerrymandering
Internet
Legislatures
Markov analysis
Markov chains
Mathematics
Nesting
Partisanship
Political parties
Redistricting
Voting rules
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Summary:In eight states, a "nesting rule" requires that each state Senate district be exactly composed of two adjacent state House districts. In this article, we investigate the potential impacts of these nesting rules with a focus on Alaska, where Republicans have a 2/3 majority in the Senate while a Democratic-led coalition controls the House. Treating the current House plan as fixed and considering all possible pairings, we find that the choice of pairings alone can create a swing of 4-5 seats out of 20 against recent voting patterns, which is similar to the range observed when using a Markov chain procedure to generate plans without the nesting constraint. The analysis enables other insights into Alaska districting, including the partisan latitude available to districters with and without strong rules about nesting and contiguity. Supplementary materials for this article are available online.
ISSN:2330-443X
2330-443X
DOI:10.1080/2330443X.2020.1774452