-Results computer VaR at 99% confidence level in the method of variance-covariance are relative to each other (because the stocks have a correlation with each other). But in historical simulation, the difference of each other relatively large, especially relatively low weight rating (251, 847.04) and past simulations typically superior high (485, 757.54). It may be due to the assumption that the distribution of historical data will repeat in the future. This assumption is quite unrealistic, especially in the context of Vietnam stock market are young and are more erratic fluctuations. Or it could be because the data is too large and the time too long, the information was too old, revealed many limitations in making predictions in the future.
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