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- W2046456988 abstract "Outliers in time series have the potential to affect parameter estimates and forecasts when using exponential smoothing. The aim of this study is to show the way in which important types of outliers can be incorporated into linear innovations state space models for exponential smoothing methods. The types of outliers include an additive outlier, a level shift, and a transitory change. The general innovations state space model and a special case which encompasses the common linear exponential smoothing methods are examined. A method for identifying outliers using innovations state space models is proposed. This method is investigated using both simulations and applications to real time series. The impact of an outlier’s location on the forecasts and the estimation of parameters is examined. The forecasts from outlier and basic non-outlier models are compared. An automatic method is found to result in improved forecasts for both the simulated and real data." @default.
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- W2046456988 date "2012-04-01" @default.
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- W2046456988 title "A study of outliers in the exponential smoothing approach to forecasting" @default.
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- W2046456988 doi "https://doi.org/10.1016/j.ijforecast.2011.05.001" @default.
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