Abstract. Designing experiments for generalized linear models is difficult because optimal designs depend on unknown parameters. Here we investigate local optimality. We propose to study for a given design its region of optimality in parameter space. Often these regions are semi-algebraic and feature interesting symmetries. We demonstrate this with the Rasch Poisson counts model. For any given interaction order between the explanatory variables we give a characterization of the regions of optimality of a special saturated design. This extends known results from the case of no interaction. We also give an algebraic and geometric perspective on optimality of experimental designs for the Rasch Poisson counts model using polyhedral and spectrahedral geometry.
Abstract. The Cambridge Compromise composition of the European Parliament allocates five base seats to each Member State's citizenry, and apportions the remaining seats proportionately to population figures using the divisor method with rounding upwards and observing a 96 seat capping. The power-weighted variant avoids the capping step, proceeding instead by a non-linear downweighting of the population figures until the largest State is allocated exactly 96 seats. The pertinent calculations of the variant are described, and its relative constitutional merits are discussed.
Procedural steps for the European Parliament elections are proposed so as to achieve more uniformity among the national electoral provisions of the 27 Member States. The steps include the creation of a European Electoral Authority, the enhancement of the European party system, and the consolidation of the many diverse seat apportionment methods into the single equalityoriented divisor method with standard rounding (Webster/Sainte-Laguë). The introduction of semi-open list systems is addressed, as is the formation of a single European constituency for the election of an additional twenty-five MEPs. In the long run the translation of votes into seats could be carried out using the biproportional variant of the divisor method with standard rounding, in order to better mirror the structure of the European Union.
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