4WILLIAMS G. Rattle: a data mining GUI for R [J]. The R Journal, 2009(1) : 45-55.
5FOX J. Getting Started With the R Commander: A Basic-Statistics Graphical User Interface to R [ J]. Journal of Statistical Software, 2005, 14(9): 1-42.
6贾俊平,何晓群,金勇进.统计学(第4版)[M].北京:中国人民大学出版社,2009.
7R. N. Mantegna, H. E. Stanley. An Introduction to Econophysics[M]. Cambridge: Cambridge University Press, 2000.