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Farrell (2001) finds that while generally majoritarian systems tend to produce more disproportionatal elections results than PR systems, this is not surprising. However, he also points out that this is not a hard and fast rule, showing that there are many different factors in elections that affect the proportionality of the results, not just the voting system. For example, in the UK General elections, results have become less proportional with the increase in support for the small parties. The DV Score for the 2005 election was 20.6 but in 1951, when the Labour and Conservatives between them gained over 90 percent of the vote, the result was highly proportional with a DV score of 4.1, lower even than the Northern Ireland Assembly under STV. Other influences on proportionality include the magnitude of electoral districts and the number of seats in the assembly. Farrell shows that while majoritarian systems are less proportional in general, there are also many factors affecting proportionality other than just the voting system. He also points to the findings of Richard S Katz who contends that different types of PR systems in and of themselves do not tend to produce greater or lesser degrees of proportionality. Instead, the size of the electoral districts is a more important determinant of proportionality.92 Farrell's 2001 analysis, which tests Katz conclusion shows that if ranked by district magnitude, disproportionality under different systems decreases as district magnitude increases.93 Therefore on balance, discussions about proportionality should take into account the complex causes of disproportionality.

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