Stock Market Prices in China: Efficiency, Mean Reversion, Long Memory Volatility and Other Implicit Dynamics

Luis A. Gil-Alana ； Yun Cao

《Advances in Financial Planning and Forecasting》 5期 (2012/12) Pp. 171-193

https://doi.org/10.6292/AFPF.2012.05.07

並列摘要

This paper analyzes the long-term dynamics of Chinese stock market prices, using the data series of daily closing spot price indices from Shanghai and Shenzhen stock markets, two major stock exchange markets in China. Both autoregressive and fractional models have been employed: in the former case, we implement standard unit root tests to determine the nonstationarity; while for the fractional I(d) models, we use a parametric testing procedure developed by Robinson (1994) and a semiparametric estimation method based on a ”local” Whittle estimate of d (Robinson, 1995). The results show strong evidence in favour of unit roots and thus lack of mean reverting behaviour for the log-prices series, when using both the classical methods based on integer degrees of differentiation but also when applying fractionally integrated techniques. On the other hand, when examining the volatility processes by means of studying the absolute and the squared returns series, the results strongly support the view of fractional integration in all cases, with the orders of integration fluctuating in the range (0, 0.5). This implies stationary long memory in volatility.

並列關鍵字

Stock Market Prices ； Fractional Integration ； Financial Time Series Data

參考文獻

Beltratti, A., Bortolotti, B., & Caccavaio, M. (2009). Who gains from financial reforms? Evidence from the Chinese stock market. Working paper, Bocconi University, Milan, Italy

Caporale, G. M., & Gil-Alana, L. A. (2007). Long run and cyclical dynamics in the US stock market. Working paper, Brunel University, Uxbridge, UK

Abadir, K. M.,Distaso, W.,Giraitis, L.(2007).Nonstationarity-extended local Whittle estimation.Journal of Econometrics.141,1353-1384.

Barkoulas, J. T.,Baum, C. F.(1996).Long term dependence in stock returns.Economics Letters.53,253-259.

Barkoulas, J. T.,Baum, C. F.,Travlos, N.(2000).Long memory in the Greek stock market.Applied Financial Economics.10,177-184.