Abstract
This paper evaluates the ablility of an autoregressive integrated moving average (arima) model to forecast monthly milk output before and after the imposition of quotas in April 1984. In the post quota period the standard arima model is modified to a ‘discontinuity’ model allowing the quota to be represented explicitly. It is concluded that for a medium term forecast this is preferable to the standard arima model, whilst for one period ahead forecasts the models are equally good.
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