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matlab Financial Time Series the ARMA modeling results Analysis: 1. predicted results from the fourth step, the predicted values no longer change, because th e ARMA convergence regression model, and the work we do is not analog, so when the prediction step enough after a long time, it will eventually converge to a become predictive value since the predicted value, why restore volume, maximum predicted mean forecast in the confidence interval for the difference than forecast average with the minimum difference big? Because the logarithmic differential value reduction required to exponential function is a concave function