Preferred numbers and the distribution of trade sizes and trading volumes in the Chinese stock market

Guo-Hua Mu, Wei Chen, J\'anos Kert\'esz and Wei-Xing Zhou

Papers from arXiv.org

Abstract: The distribution of trade sizes and trading volumes are investigated based on the limit order book data of 22 liquid Chinese stocks listed on the Shenzhen Stock Exchange in the whole year 2003. We observe that the size distribution of trades for individual stocks exhibits jumps, which is caused by the number preference of traders when placing orders. We analyze the applicability of the "$q$-Gamma" function for fitting the distribution by the Cram\'{e}r-von Mises criterion. The empirical PDFs of trading volumes at different timescales $\Delta{t}$ ranging from 1 min to 240 min can be well modeled. The applicability of the $q$-Gamma functions for multiple trades is restricted to the transaction numbers $\Delta{n}\leqslant8$. We find that all the PDFs have power-law tails for large volumes. Using careful estimation of the average tail exponents $\alpha$ of the distribution of trade sizes and trading volumes, we get $\alpha>2$, well outside the L{\'e}vy regime.

Date: 2008-12
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Published in Eur. Phys. J. B 68, 145-152 (2009)

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Journal Article: Preferred numbers and the distributions of trade sizes and trading volumes in the Chinese stock market (2009)
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