摘要：In recent years, the R system has evolved to a mature environment for statistical data analysis, the development of new statistical techniques, and, together with an increasing number of books, papers and online documents, an impressing basis for learning, teaching and understanding statistical techniques and data analysis procedures. Moreover, due to its powerful matrix-oriented language, the clear interfaces and the overwhelming amount of existing basic and advanced libraries, R became a major platform for the development of new data analysis software (Tierney, 2003).
