Hello,I'm working with Gretl and I'm trying to introduce 'boost (impulso)
variable' as a dependent variable in my ARIMA model but I'm not sure about the
inputs that Arima function needs. I'm transforming my series by adding regular and
seasonal differences. I have only a model with a constant but I see in residual plot
against time an 'outlier' in t0. What input Gretl need to estimate w0 'boost
(impulso) variable' coeficient? Could be an all-zero vector except for a 1 in t = t0
(called I)? Or could be sd_d_I? Thanks a lot!
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