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- W1970694313 abstract "The random walk problem has a long history. In fact, its application to the movement of security prices predates the application to Brownian motion.' And now it is generally accepted that, at least to a good approximation, ln (S), where S is the price of a common stock, follows a random walk.2 The diffusion constant characterizing that walk for each stock thus becomes an important quantity to calculate. In Section II, we describe the general random walk problem and show how the diffusion constant is traditionally estimated. In Section III, we discuss another way to estimate the diffusion constant, the extreme value method. In Section IV, we compare the traditional and extreme value methods and conclude that the extreme value method is about 21/2-5 times better, depending on how you choose to measure the difference. In Section V, we discuss the use of this method for the estimation of the variance of the rate of return of a common stock. If S is the price of a common stock, it is now generally accepted that In (S) follows a random walk, at least to a very good approximation. The diffusion constant characterizing that walk, which is the same as the variance of the rate of return, thus becomes an important quantity to calculate and is traditionally estimated using closing prices only. It is shown that the use of extreme values (the high and low prices) provides a far superior estimate." @default.
- W1970694313 created "2016-06-24" @default.
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- W1970694313 date "1980-01-01" @default.
- W1970694313 modified "2023-10-14" @default.
- W1970694313 title "The Extreme Value Method for Estimating the Variance of the Rate of Return" @default.
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- W1970694313 doi "https://doi.org/10.1086/296071" @default.
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