a) What is the main purpose of Time series forecasting in contrast to mainstream econometrics?

b) Outline the two basic structures that form the building blocks of time series modelling. 

c) How is non-stationarity usually handled in this framework? 

d) Outline the basic structure of the EWMA model and contrast the purpose of the centred EWMA with the non centred one. 

e) Outline the process of Box-Jenkins modelling including the use of the autocorrelation function and the partial autocorellation function.