Simulating ARMA Models using Excel

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How do we simulate AR, MA and ARMA models using Excel. ARMA models are used when series is stationary. How do we simulate, estimate and do forecasting using Excel will be discussed in following videos.
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our professor wants us to find what if et~N(2, 1). Could you tell me how to change the formula of et please? and is et always random?

zhongxinma
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Excelent video! Thanks for your lesson.

ricardocunhadafonte