What does the 'q' parameter control in the arima action?

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Réponse

The 'q' parameter is used to specify the moving average (MA) polynomials of the ARIMA model, similar to how the 'p' parameter specifies the autoregressive (AR) part.
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Which estimation methods can be used for an ARIMA model? What is the purpose of the arima action in the Univariate Time Series Analysis action set? How do you specify the autoregressive part of an ARIMA model in this action? How can I apply differencing to my time series using the arima action? What kind of data transformations are available with the 'transform' parameter?
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