The 2015 election has been described as the most disproportional ever – but it wasn’t disproportional everywhere

Disproportionality is the degree of mismatch between parties’ shares of votes and their shares of seats, with measures of disproportionality usually calculated for national elections. This year’s general election was criticised by many as the least proportional ever. Chris Hanretty acknowledges that on some measures, this is a valid claim, but demonstrates that calculating a measure for local disproportionality gives a better sense of how the mismatch varied across England, Scotland and Wales.