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Can online search data improve the forecast accuracy of pork price in China?
Journal of Forecasting ( IF 2.627 ) Pub Date : 2020-01-28 , DOI: 10.1002/for.2649 Liwen Ling 1 , Dabin Zhang 1, 2 , Shanying Chen 1 , Amin W. Mugera 3
Journal of Forecasting ( IF 2.627 ) Pub Date : 2020-01-28 , DOI: 10.1002/for.2649 Liwen Ling 1 , Dabin Zhang 1, 2 , Shanying Chen 1 , Amin W. Mugera 3
Affiliation
Online search data provide us with a new perspective for quantifying public concern about animal diseases, which can be regarded as a major external shock to price fluctuations. We propose a modeling framework for pork price forecasting that incorporates online search data with support vector regression model. This novel framework involves three main steps: that is, formulation of the animal diseases composite indexes (ADCIs) based on online search data; forecast with the original ADCIs; and forecast improvement with the decomposed ADCIs. Considering that there are some noises within the online search data, four decomposition techniques are introduced: that is, wavelet decomposition, empirical mode decomposition, ensemble empirical mode decomposition, and singular spectrum analysis. The experimental study confirms the superiority of the proposed framework, which improves both the level and directional prediction accuracy. With the SSA method, the noise within the online search data can be removed and the performance of the optimal model is further enhanced. Owing to the long‐term effect of diseases outbreak on price volatility, these improvements are more prominent in the mid‐ and long‐term forecast horizons.
更新日期：2020-01-28
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