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To look at proportionality in the devolved jurisdiction elections relative to the General elections, one approach is to calculate the deviation from proportionality of the results (how far away the parties are from winning the same proportion of seats as their votes). That is, to measure how many representatives hold seats that are not justified by their party's share of the vote, either nationally or regionally. The conventional measure of deviation from proportionality is known as DV, and political scientists regard a DV score of 4-8 percentage points as indicating proportionality90.

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