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Hallo
How can do this by program?

Hello.
It's possible to generate (se) via program.

Since ETS does not provide SEs, i can not tell you how to do it in another way .
Take this as a suggestion.
Best Samia.

To tell you my best model is: Model: M,N,M - Multiplicative Error, No Trend, Multiplicative Season (Auto E=*, T=*, S=*), and in my workfile there is four series:
y_sm, y_l, y_s, y_t.
l: level
t: trend
s: seas
i would like to do this: plot y y_sm y_sm+2*y_se y_sm-2*y_se
But i can't find this :

I'm asking about how generate standard error (se), are there a solution to do this automatically, like forecasting in ARMA.

Hello I'm student in second year, i have estimate some models by simple exponential smoothing: single and double and Holt-Winters Additive for my different data. and i have make forecasting, for here no problem for me. So, how can calculate the yf+2*y_se & yf-2*y_se the two standard error bands,...