Bazi: A Free Computer Program for Proportional Representation Apportionment

  • BAZI is a freely available Java-program implementing various apportionment methods for proportional representation systems. It offers divisor methods as well as quota methods. The extensive database permits to investigate the merits of the different apportionment methods on the basis of empirical data. A particular feature of BAZI is that it offers three options for multiple electoral districts. The user may choose between (1) separate evaluations for each district, (2) biproportional apportionments using divisor methods, and (3) a variant of the latter that is specifically tailored to the needs of the new Zurich electoral law of 2003. For these matrix apportionment methods thirteen algorithms and hybrid combinations of them are available. The BAZI program also offers to include minimum and maximum restrictions for vector and matrix apportionments. We present several empirical examples where these restrictions are essential.

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Author:Sebastian MaierGND, Friedrich PukelsheimGND
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Series (Serial Number):Preprints des Instituts für Mathematik der Universität Augsburg (2007-42)
Publishing Institution:Universität Augsburg
Release Date:2007/12/11
Tag:voting system; biproportional divisor method; computer program
GND-Keyword:Verhältniswahl; Wahlverfahren; Programm
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Mathematik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Mathematik / Lehrstuhl für Stochastik und ihre Anwendungen
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 51 Mathematik / 510 Mathematik