Robust Regression in Analysis of Comparative Price Levels of EU Countries

The values of comparative price levels vary greatly in individual EU countries and depend on many different economic factors. The EU countries were divided into two distinguishable groups. Both OLS and robust regressions were used to analyze the influence of the comparative price levels on selected indicators. If outliers and leverage points were identified using robust outliers´ detection and the results of the OLS and robust fits differed significantly, the robust fits are preferred. When differences were not significant, the OLS fits can be used. Models for 27 EU countries and groups of countries differ significantly with respect to indicators included.