i'm applying a panel data analysis. I have four variables; real GDP, trade openness, energy price and energy consumption. I took ln (log)of trade openness,real GDP and energy price. but i cannot decide whether ln(log) of energy consumption should be taken or not. please inform me on this. Thank you
Note: Kg of oil equivalent per capita is used to measure energy consumption.
EN= energy consumption
T= trade openness
W= country fixed effect EN=f(Y,T,EP,W)