The model assumes that the total number of votes cast does not change, that the votes given to all other parties do not change, and that the proportion that a given party achieves in one constituency compared to another doesn’t change.
This isn't quite "straight swing" - uniform swing is mathematically messy with lots of irritating discontinuities. However, I don't suppose it gives radically different results.
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timeasmymeasure
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Date: 2007-12-31 02:48 pm (UTC)This isn't quite "straight swing" - uniform swing is mathematically messy with lots of irritating discontinuities. However, I don't suppose it gives radically different results.