Long Memory in Stock-Market Trading Volume
This article examines consistent estimation of the long-memory parameters of stock-market trading volume and volatility. The analysis is carried out in the frequency domain by tapering the data instead of detrending them. The main theoretical contribution of the article is to prove a central limit theorem for a multivariate two-step estimator of the memory parameters of a nonstationary vector process. Using robust semiparametric procedures, the long-memory properties of trading volume for the 30 stocks in the Dow Jones Industrial Average index are analyzed. Two empirical results are found. First, there is strong evidence that stock-market trading volume exhibits lone memory. Second, although it is found that volatility and volume exhibit the same decree of long memory for most of the stocks, there is no evidence that both processes share the same long-memory component.
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Volume (Year): 18 (2000)
Issue (Month): 4 (October)
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