[R] Arima and Sarima Models

[Flavio2f]

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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