R 软件在中国的下载地址 http://ftp.ctex.org/mirrors/CRAN/ CTEX.ORG http://cran.csdb.cn/ Computer Network Information Center, CAS, Beijing http://mirror.bjtu.edu.cn/cran Beijing Jiaotong University, Beijing http://cran.dataguru.cn Dataguru (a, Guangzhou http://mirrors.ustc.edu.cn/CRAN/ University of Science and Technology of China http://mirrors.xmu.edu.cn/CRAN ... ...