Study of Volatility and Party System Transformation in the 2010 Election of the Czech Chamber of Deputies

Abstract

The paper deals with measuring volatility in the election of the Chamber of Deputies in the Czech Republic, calculated for both national and regional levels (the latter being the level of electoral constituencies). The main aim of the paper is to identify the link between the gains and losses of parties, and the volatility of a region. In comparison with the 2006 election, an overall increase in volatility was recorded in 2010, but most of the more volatile regions remained the same in both elections compared. Volatility on the regional level is strongly connected with the losses of the previously governing parties (in office 2006-9) and with the gains of the strongest new party, TOP09. We also compare three possible calculations of volatility involving the category of “other” parties. In calculating volatility we could not recommend the omission of “other” parties from the numerator without a corresponding change in the denominator. As for the remaining two methods (“other” parties calculated as one bloc, or “other” parties omitted both in the numerator and the denominator), future comparisons would be required.