Chris Warshaw for Monkey Cage: There are several ways to measure partisan advantage in a districting plan, including the efficiency gap, partisan symmetry, declination and the mean-median difference. These metrics all capture distortions in the vote-seat relationship. In a recent work, Nicholas Stephanopoulos and I averaged … Continue reading “The Supreme Court is deciding a gerrymandering case. Here’s the social science that the justices need to know.”