کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
978903 | 933309 | 2010 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Contemporaneous aggregation and long-memory property of returns and volatility in the Korean stock market Contemporaneous aggregation and long-memory property of returns and volatility in the Korean stock market](/preview/png/978903.png)
The principal objective of this study is to determine whether the long-memory property is real or a spurious result caused by contemporaneous aggregation. In order to assess the presence of long memory in returns and volatility, two different long-memory detection techniques (modified R/S analysis and the GPH test) were applied to the KOSPI 50 index and its 50 constituent individual stock prices. According to the empirical evidence gleaned from the two long-memory tests, we conclude that there exists significant evidence for the long-memory property in volatility in both the market index and in a majority of individual stocks. These findings indicate that the observed evidence of the long-memory feature in volatility of index series is not spurious, and that we can reject the hypothesis that spurious long-memory evidence in the volatility of index series is the consequence of contemporaneous aggregation. However, this conclusion should be considered cautiously, given that a considerable number of the individual stock volatilities in square returns strongly show a short-memory property, as the level of significance in statistical decisions is lowered to the 1% level.
Journal: Physica A: Statistical Mechanics and its Applications - Volume 389, Issue 21, 1 November 2010, Pages 4844–4854