Find Conditions for Stationarity and Invertibility of Time Series Processes

    
Find conditions for an ARMAProcess[2,2] to be weakly stationary, using WeakStationarity:
Find an instance of a weakly stationary ARMAProcess[2,2]:
Check that the process is weakly stationary:
Find conditions for an ARMAProcess[2,2] to be invertible, using TimeSeriesInvertibility:
Find an instance of an invertible ARMAProcess[2,2]:
Check that the process is invertible: