Theoretical Expectations and Actual Outcomes of Electoral Systems : How to Measure the Size of the Deviation?

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Authors	NEMČOK Miroslav ŠEDO Jakub
Year of publication	2018
Type	Article in Periodical
Magazine / Source	World Political Science
MU Faculty or unit	Faculty of Social Studies
Citation
Web	článek
Doi	http://dx.doi.org/10.1515/wps-2018-0008
Keywords	electoral systems; measurement tool; Seat Product Model; size of deviation; theoretical expectations
Attached files	Nemcok_Sedo_-_Theoretical_Expectations_and_Actual_Outcomes_of_Electoral_Systems_How_to_Measure_the_Size.pdf
Description	The article criticises current conceptual frameworks focused on the evaluation of the performance of electoral systems. It offers a new tool allowing researchers to measure the size of the deviation of electoral outcomes from theoretical expectations. The index d=log[N_s/(MS)^1/6] is built on the Seat Product (Taagepera, Rein (2007b) Predicting Party Sizes: The Logic of Simple Electoral Systems. New York: Oxford University Press) and captures the deviations of electoral outcomes from predictions solely on the basis of two institutional factors – average district magnitude (M) and size of assembly (S). The theoretical background of index d is explained, and its reliability is further supported by conventional econometric methods based on empirical data.
Related projects:	Aktuální problémy politologického výzkumu IV.