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Which conditions should the expected cointegration mean satisfy?. Generally we would like the mean of an equilibrium error to be equal to zero!. We use the identity. The case with a constant and a trend. When there is a linear time trend in the equations, then:. A simulated example.
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Which conditions should the expected cointegration mean satisfy? Generally we would like the mean of an equilibrium error to be equal to zero! We use the identity
The MA representation with a trend in the equations: Linear trends in the variables can derive from:
The simplified model can be written as: The expected value of the process and the cointegration relations becomes:
The dynamic properties of the data can now be expressed as: where It is easy to see that: