This study investigates the relationship between PE and macroeconomic variables. In this paper, 21 macroeconomic variables are selected with decomposition to nominal and real variables. Also for detrending, trend variable is entered in model as an independent variable and multiple regression and factorial analysis are used for surveying research hypothesis. The multiple regression analysis result indicates that there is strict correlation between selected variables. However, it is confirmed the relationship between the independent variables and dependent variable (PE) by using factorial analysis and major component method.