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Forcast function for ARMA models

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Patricia Alejandra Palacios Romero
I'm trying to use the built-in function forecast. But when I apply it I'm just getting a constant value. Is there any reason for that? or am I just using it wrong? Here is more or less the code:
toEstMdl = arima(2,0,0);
EstMdl = estimate(toEstMdl,Residuals);
estValues = forecast(EstMdl,k);

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