Statistical analysis of this Sunday’s parliamentary election results appears to show evidence of some of the same irregularities that plagued the 2011 State Duma contest, according to the Slon news website. The outlet’s senior editor, Mikhail Zelensky, cites findings that suggest nearly half of all the votes recorded for United Russia, the ruling political party, may have been falsified.

According to the Central Election Commission’s official results, United Russia won a historic 343 seats in the next Duma, granting it a massive 76-percent supermajority capable of amending the constitution without support from any rival parties.

Zelensky highlights that United Russia’s performance on Sunday violates some of the statistical assumptions political scientists make about free and open elections, explaining that graphing turnout and voting distribution, as well as turnout and absolute votes, should yield a bell-shaped curve — a so-called Gaussian distribution. According to data from the Central Election Commission, United Russia’s results defy these expectations.

Russia’s three other major political parties (A Just Russia, LDPR, and the Communist Party) gained most of their votes at precincts where they won roughly 10–20 percent of the total. In other words, these opposition parties very rarely won more than 40 percent of the vote at any single voting station.

United Russia, on the other hand, won millions of votes in precincts where it captured more than 70 percent of all ballots cast, meaning that the party continued to earn enormously high numbers of votes even in places where nearly every voter supported United Russia (a bizarre phenomenon most spectacularly visible in Chechnya).

Russia’s party of power also managed to attract drastically more supporters in voting stations with higher turnout, unlike the other three major parties.