Can anyone help clarify a few things about telling the time series model used based on the (partial) autocorrelation graphs. For example, if I have to difference a series once to get the autocorrelation and partial correlation graph completely within the confidence bands, does that mean it's ARIMA(0,1,0)? What if without differencing, there is 1 spike at the start of both the partial autocorrelation and the autocorrelations graphs, is that ARIMA(1,0,1) or is it either AR(1) or MA(1)? Also, if I think there's seasonality in the model, how do I incorporate that into the ARIMA model?(adsbygoogle = window.adsbygoogle || []).push({});

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# Homework Help: Time Series Modelling

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