Commodity prices are affected by supply and demand conditions and other uncertain factors which are difficult to predict. Particularly, there is greater variability in farm-product prices as they are affected by long-term unpredictable factors such asweather conditions, demands and so on, because it takes long periods of time to harvest crops. To predict price variations, various models such as 'Price Fluctuation Probability based on Reliability Analysis Method' (PFPRA), 'Prediction of Price Changeusing Signal Sampling Method'(PPCSS), 'Establishment of Range of Risk in accordance with Price Change (ERRPC)' have been developed .
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