Dears I would like to know the command line to: 1. plot the periodogram of a time series 2. To calculate a sazonal difference of the 7th order 3. Put the AR or MA term of the 9th order sazonal (or not-sazonal) part. 4. The significance level (P-value) for the estimated parameters of the ARMA(1,1), e.x. The default output is the parameter value and his s.e. . Thaks Flávio
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