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You cannot just use the log of variables when you feel to. One only uses log to smooth out the variability seen in data. Be very cautious when using the log of any variable. OLS estimation is only justified if all your variables are I(0) otherwise you will end up with the spurious regression problem. Think about the reasons you are creating this model-is it for short term forecasting, long term forecasting etc. This will help you narrow which types of econometric modelling you may want to use. Each has its own advantages and disadvantages. It is alot of fun. Take care.
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