The Australian Labor Party won the 2022 federal election, winning 77 of 151 seats in the House of Representatives.
The Mackerras pendulum was devised by the Australian psephologist Malcolm Mackerras as a way of predicting the outcome of an election contested between two major parties in a Westminster style lower house legislature such as the Australian House of Representatives, which is composed of single-member electorates and which uses a preferential voting system such as a Condorcet method or instant-runoff voting.
Given a uniform swing to the opposition or government parties, the number of seats that change hands can be predicted.
[3] ABC psephologist Antony Green observed that due to the considerably expanded size of the crossbench following this election, the traditional two-column format of the Mackerras pendulum had become strained, and that the crossbench deserved more attention than its position at the bottom-right of the table suggested.
[4] Election analyst Ben Raue observed that the use of the two-party-preferred count in the Mackerras Pendulum also had the effect of classifying several seats as safer than they really were: for example, the seat of Macnamara ended up with a 12.25% margin of victory for the Labor candidate, but if just 0.64% of voters had changed their preference to rank the Greens higher than Labor, Labor would have finished third, with the Greens winning the seat by a similarly large margin.