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it root test and why is it important to perform a unit root What are the null and alternative hypothesis under each variant of the Dickey-Fuller test?...

  1. What is a unit root test and why is it important to perform a unit root
  2. What are the null and alternative hypothesis under each variant of the Dickey-Fuller test? 
  3. Why were vector auto-regressions developed? What issues were they trying to address? 
  4. What does a 2-variable vector auto-regression look like in equation form? What is unique about the error terms? 
  5. Can you estimate VARs with OLS or do you need to use system estimator? 

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