Applications of skewness and kurtosis in bisciences
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Skewness essentially measures the relative size of the two tails. Kurtosis is a measure of the combined sizes of the two tails. It measures the amount of probability in the tails. The value is often compared to the kurtosis of the normal distribution, which is equal to 3.
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Skewness can be used to obtain approximate probabilities and quantiles of distributions (such as value at risk in finance) via the Cornish-Fisher expansion. Many models assume normal distribution; i.e., data are symmetric about the mean. The normal distribution has a skewness of zero.
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