The Measurement of Party Competition*

David J. Elkins

American Political Science Review, 1974, vol. 68, issue 2, 682-700

Abstract: Most measures of party competition were designed for the United States or other two-party systems. The measure proposed here is intended for multiparty as well as two-party systems. It is a formalization of the notion of uncertainty: election outcomes are competitive to the degree we are uncertain who will win. By ascertaining through survey research the degree of party loyalty over time, one can calculate the chances of alternative outcomes in hypothetical replications of any given election. Since the chance that a losing party might have won is one measure of the importance of that party, this approach to party competition also provides a precise indicator of the number of parties in the system (i.e., whether it is two-party, three party, etc.). The method is applied here to data on Canadian federal elections in 1965 and 1968.

Date: 1974
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