Multiplicative interaction models are common in the quantitative political science literature. This is so for good reason. Institutional arguments frequently imply that the relationship between political inputs and outcomes varies depending on the institutional context. Models of strategic interaction typically produce conditional hypotheses as well. Although conditional hypotheses are ubiquitous in political science and multiplicative interaction models have been found to capture their intuition quite well, a survey of the top three political science journals from 1998 to 2002 suggests that the execution of these models is often flawed and inferential errors are common. We believe that considerable progress in our understanding of the political world can occur if scholars follow the simple checklist of dos and don'ts for using multiplicative interaction models presented in this article. Only 10% of the articles in our survey followed the checklist.
Methodological problems associated with selection bias and interaction effects have hindered the accumulation of systematic knowledge about the factors that explain cross-national variation in the success of extreme right parties. The author uses a statistical analysis that takes account of these problems to examine the effect of electoral institutions, unemployment, and immigration on the support for these parties. The data set used in this analysis is new and spans 19 countries and 165 national elections. There are four substantive conclusions. The first is that it is important to distinguish between neofascist and populist parties on the extreme right because their fortunes depend on different factors. The second is that populist parties do better in countries where the district magnitude is larger and more seats are allocated in upper tiers. The third is that although immigration has a positive effect on populist parties irrespective of the unemployment level, unemployment only matters when immigration is high. Finally, there is evidence that the permissiveness of the electoral system mediates the effect of immigration on populist parties.
Although the literature examining the relationship between ideological congruence and electoral rules is quite large, relatively little attention has been paid to how congruence should be conceptualized. As we demonstrate, empirical results regarding ideological congruence can depend on exactly how scholars conceptualize and measure it. In addition to clarifying various aspects of how scholars currently conceptualize congruence, we introduce a new conceptualization and measure of congruence that captures a long tradition in democratic theory emphasizing the ideal of having a legislature that accurately reflects the preferences of the citizenry as a whole. Our new measure is the direct counterpart for congruence of the voteseat disproportionality measures so heavily used in comparative studies of representation. Using particularly appropriate data from the Comparative Study of Electoral Systems, we find that governments in proportional democracies are not substantively more congruent than those in majoritarian democracies. Proportional democracies are, however, characterized by more representative legislatures.A re representatives in some democracies more congruent with the ideological preferences of the people than those in other democracies? A large number of studies have examined the relationship between ideological congruence and electoral institutions (Blais and . Most have found that democracies employing proportional representation (PR) electoral rules produce more ideological congruence between citizens and their representatives than democracies employing majoritarian ones. This literature, however, has paid relatively little attention to how ideological congruence should be conceptualized.To date, the predominant way to conceptualize and measure citizen-representative congruence is in terms of the absolute ideological distance between the median citizen and the government. However, this is just one of
The far right party family is the fastest-growing party family in Europe. In addition to describing the ideological makeup of the far right party family, this review examines demand-side and supply-side explanations for its electoral success. Demand-side explanations focus on the grievances that create the "demand" for far right parties, whereas supply-side explanations focus on how the choices that far right parties make and the political opportunity structure in which they act influence their success. The review finishes by suggesting that far right scholars must recognize the interaction between demand-side and supply-side factors in their empirical analyses in order to draw valid inferences and that it would be productive to pay more attention to the political geography of far right support and the different stages of far right success.
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