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Advantages and disadvatages of variance-covariance method (compare with historical method)?please use your own words to explain,thanks.

Advantages and disadvatages of variance-covariance method (compare with historical method)?please use your own words to explain,thanks.

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Historical VaR method is used to calculate the returns using the actual historical data for a period. It's advantage is that it does not assume any probability distributions for the data and hence the user does not have to worry if the data satisfies the criteria of a particular distribution or not.The disadvantage is that since it is based on historical data only, it may not hold good in the future.

Variance Co-variance method derives the VaR using the return, Z-score and standard. It's advantage lies in it simplifying its assumptions. It assumes that returns are normally distributed. However its biggest disadvantage is that it can be applied to data sets with a normal distribution.

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