Yang, Jae-Suk; Kwak, Wooseop; Kaizoji, Taisei; Kim, In-mook - In: The European Physical Journal B - Condensed Matter and … 61 (2008) 2, pp. 241-246
We study the temporal evolutions of three stock markets; Standard and Poor's 500 index, Nikkei 225 Stock Average, and the Korea Composite Stock Price Index. We observe that the probability density function of the log-return has a fat tail but the tail index has been increasing continuously in...