cheetahfly 发表于 2019-4-21 21:59 
非常感谢你的分享,我也不确定是不是最后版本,不过大神Hadley Wickham的大作,我是不会记错的。
https: ...
The book in the link is the first edition. Hadley Wickham is writing the second edition and the book will be published by CRC. The link that I posted is for the second edition.