Abstract
We propose a minimum mean absolute error linear interpolator (MMAELI), based on theL 1 approach. A linear functional of the observed time series due to non-normal innovations is derived. The solution equation for the coefficients of this linear functional is established in terms of the innovation series. It is found that information implied in the innovation series is useful for the interpolation of missing values. The MMAELIs of the AR(1) model with innovations following mixed normal andt distributions are studied in detail. The MMAELI also approximates the minimum mean squared error linear interpolator (MMSELI) well in mean squared error but outperforms the MMSELI in mean absolute error. An application to a real series is presented. Extensions to the general ARMA model and other time series models are discussed.
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This research was supported by a CityU Research Grant and Natural Science Foundation of China.
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Lu, Z., Hui, Y.V. L 1 linear interpolator for missing values in time series. Ann Inst Stat Math 55, 197–216 (2003). https://doi.org/10.1007/BF02530494
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DOI: https://doi.org/10.1007/BF02530494