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Representing Districts and Parties: Double Proportionality

In: Proportional Representation

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  • Friedrich Pukelsheim

    (Universität Augsburg, Institut für Mathematik)

Abstract

Double-proportional divisor methods take account of two dimensions: the geographical division of the electorate by district, and the political division of the electorate by party. At the outset all available seats are allocated between districts proportionally to population figures, and among parties proportionally to countrywide vote counts. The subsequent step is the essence of the method: the sub-apportionment of seats simultaneously by district and party. The result must conform to both dimensions: every district must meet its district magnitude, and every party must exhaust its countrywide seats. To this end two sets of electoral keys are employed: district divisors, and party divisors. The sub-apportionment is easily verified provided the divisors are publicized.

Suggested Citation

  • Friedrich Pukelsheim, 2017. "Representing Districts and Parties: Double Proportionality," Springer Books, in: Proportional Representation, edition 2, chapter 0, pages 259-273, Springer.
    • Handle: RePEc:spr:sprchp:978-3-319-64707-4_14
    DOI: 10.1007/978-3-319-64707-4_14
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