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Estela Bee Dagum, Modelling, Forecasting and Seasonally Adjusting Economic Time Series with the X-11 ARIMA Method, Journal of the Royal Statistical Society. Series D (The Statistician), Vol. 27, No. 3/4, Partial Proceedings of the 1978 I.O.S. Annual Conference on Time Series Analysis (and Forecasting) (Sep. - Dec., 1978), pp. 203-216
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Estela Bee Dagum (1978) studied this question.
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