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Across the 12 general elections from 1992 to 2024, the site correctly predicted the party to win the most seats in all but one (1992). They also correctly predicted the outcome, that is, the party winning a majority or a hung parliament, in six elections (majorities in 1997, 2001, 2005, 2015, 2017 (by a majority of only 3), 2019, 2024; hung parliament for 2010).
The concept became important in the general elections of the 1950s when it was found that there was a relatively uniform swing across all constituencies. This made it easy to predict the final outcomes of general elections when few actual results were known, as the swing in the first constituencies to declare could be applied to every seat.
Pollsters return to the same polling stations at the same times at each election, and by comparing the results with previous exit polls they can calculate how the distribution of votes has changed in that constituency. This swing is then applied to other similar constituencies, allowing an estimate of how national voting patterns have changed.
Under the uniform national swing, changes in the vote proportions since the previous election are assumed to be constant across all constituencies. By applying this change to the previous per-constituency based vote proportions, a prediction for which party would have the most votes in each constituency may be made, which is then counted and ...
Further notional results were created for the 1997 general election (to compare with the 1992 general election), in 2005 (to take into account the reduction in the number of Scottish constituencies brought about by the establishment of the Scottish Parliament), [2] and in the 2010 general election (to compare with the 2005 general election).
Polling guru John Curtice gives his views on Rishi Sunak and Sir Keir Starmer’s chances in the general election on 4 July
Off-target predictions about U.S. presidential races have been abundant in recent election cycles. Seldom, however, do prominent miscalls create lasting repercussions for the wayward prognosticator.
An electoral swing analysis (or swing) shows the extent of change in voter support, typically from one election to another, expressed as a positive or negative percentage. A multi-party swing is an indicator of a change in the electorate's preference between candidates or parties, often between major parties in a two-party system.