Abstract
This article describes the relation between the existence of regional parties in Romania vs. stable democracies like Belgium and Germany and the degree of regional issue dimensions reflected by partiesí electoral support. It also reflects the impact of regional dimension on voting behavior. The research is based on the nationalization concept introduced by Mark P. Jones and Scott Mainwaring, well operationalized here by Gini Index based vote share of parties in subunits applied on one or more countries. From here, the study wants to promote a new formula which permits the evaluation of regional dimension from all issue dimensions of a country and counting the score like a reflection of differences between parties (regional, national), the differences between voters expectations on regional issues, the competition pattern, the increase or decrease of the national issue dimensions by changing inside the given party system