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Swing, in the politics of the United Kingdom, is a number used as an indication of the scale of voter change between two political parties. It originated as a mathematical calculation for comparing the results of two Parliamentary constituencies. The UK uses a first-past-the-post voting system. The swing (in percentage points) is the percentage of voter support minus the comparative percentage of voter support corresponding to the same electorate or demographic.
The swing is calculated by comparing the percentage of voter support from one election to another. The percentage value of the comparative elections results are compared with the corresponding results of the substantive election. An electoral swing analysis shows the extent of change in voter support from one election to another. It can be used as a means of comparison between individual candidates or political parties for a given electoral region or demographic.