R 入門 R ノート: データ解析とグラフィックスのためのプログラミング環境 Version 1.7.0 (2003-04-16) W. N. Venables, D. M. Smith and the R Development Core Team Copyright c 1990 W. N. Venables Copyright c 1992 W. N. Venables & D. M. Smith Copyright c 1997 R. Gentleman & R. Ihaka Copyright c 1997, 1998 M. Maechler Copyright c 1999–2002 R Development Core Team Permission is granted to make and distribute verbatim copies of this manu