Intra-day variability of the stock market activity versus stationarity of the financial time series

T. Gubiec and M. Wili\'nski

Papers from arXiv.org

Abstract: We describe the impact of the intra-day activity pattern on the autocorrelation function estimator. We obtain an exact formula relating estimators of the autocorrelation functions of non-stationary process to its stationary counterpart. Hence, we proved that the day seasonality of inter-transaction times extends the memory of as well the process itself as its absolute value. That is, both processes relaxation to zero is longer.

Date: 2014-08
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