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

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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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arima

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Other questions about arima
What kind of data transformations are available with the 'transform' parameter? What is the purpose of the arima action in the Univariate Time Series Analysis action set? How do I generate forecasts with the arima action? How do you specify the autoregressive part of an ARIMA model in this action? Which estimation methods can be used for an ARIMA model?
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