Vote Swing Simulator
Transfer a selected percentage of one party's constituency-level votes to another party. PMAC recalculates party totals, seat winners and margins without changing the stored official results.
This is a mathematical counterfactual, not a prediction. It assumes the selected percentage moves uniformly in every constituency where the source party has votes.
Before and after simulation
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00 winner changes
Try a larger transfer percentage or a different party pair.
