[EM] Redistricting Paper w/ New Population Density Fairness (PDF) measure

[Kathy Dopp]

To measure whether a plan is proportionately fair -- giving both urban
and rural dwellers representation roughly proportional to their
population -- this attached article now introduces an objective,
nonpartisan population density fairness (PDF) measure for evaluating
when a plan produces legislative representation approximately
proportional to its relative share of regions having diverse
population densities.

I worked really hard to simplify the measure after deriving it in a
much more complicated fashion.

I have posted the revised paper, with its fairly simple new population
density fairness measure described on pp. 20-24, here:

http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1945879