Party systems in subnational regions may to be research by some comparative politics methods. One of them is quantitative typologies of party systems, proposed by M. Duverger, J.Blondel and G. Sartory. But these methods become effective only with usе of some indexes, which urged to estimate scales and intensity of an interparty competition. The wide circulation was received by an index of effective number of parties (ENP), the offered M. Laakso and R. Taagepera (1979). The analysis of merits and demerits of this index leads scientists from the different countries to necessity of development of alternative and correcting quantity indicators. Interesting example of this work is formula ENP of G.V. Golosov (2010). In this article the comparative analysis of indexes of Laakso-Taagepera and Golosov on the basis of materials of elections in Legislative Assemblies of regions of Western Siberia which have taken place in 2000th years is carried out. As basis for calculations the data placed in a database of the Center of assistance of democracy and human rights «GELIKS» and on official sites of election committees of Omsk and Tomsk areas has served. The obtained data testifies that the index of Golosov shows lower values for all studied cases and it allows avoiding revaluation of a share of the largest party in system. Therefore with its help it is possible to estimate more precisely scales of an interparty competition in each region. However this index poorly reacts to degree of coverage by parties of the deputy case. Calculation of indexes of LaaksoTaageperа and Golosov for the legislatures of Western Siberia allows describing dynamics of regional party systems in a new fashion. The defragmentation of party systems was accompanied in first half 2000th by strengthening of positions of parties in regions and competition growth between them. But subsequently this competition is curtailed that everywhere leads to one-party domination. Thus, unification of party systems becomes one more tendency of development of a regional policy in second half 2000th.

Исследуются партийные системы в российских регионах на основе использования методов сравнительной политологии. На материалах выборов в Западной Сибири проведен сравнительный анализ индексов эффективного числа партий по формулам Лааксо-Таагеперы и Голосова, а также описаны основные тенденции эволюции партийных систем в сибирских регионах.