This question is not connected directly with gretl but I'll be grateful for your opinions. I've estimated panel data models for mainly UE countries with consumption, gross savings, invstments and money supply (M1) as dependent variables and income, interes rates, consumer prices index and time variable as an independent variables. Should all theses variables be corrected with restpect to inflation rates? Or maybe it's better idea to put inflation rate as an independent variable? Many keynesian economists used to analylize nominal variables...